Definition:
Informal language is the variety of a language used in relaxed, familiar, or casual communicative contexts — in conversation with friends, social media messages, personal texts, casual emails, and everyday spoken interaction. It is characterized by contractions (“I’m,” “don’t,” “gonna”), colloquial vocabulary (“hang out,” “stuff,” “loads of”), reduced grammatical structures (topic fronting, sentence fragments, omitted subjects), slang, idioms and phrasal verbs, hedges and vague language (“sort of,” “kind of,” “like”), and often by culturally specific references, humor, and group identity markers. Informal language is not “bad” grammar — it is a full-fledged register with its own consistent grammar — but it contrasts systematically with formal language along multiple dimensions. Many L2 learners have a profound mismatch: they are strong in formal written register (learned through textbooks and academic instruction) but struggle in informal spoken interaction, precisely because informal register is underrepresented in traditional curricula.
Features of Informal Language
Contractions: “I’m,” “she’s,” “we’ve,” “don’t,” “can’t,” “wouldn’t’ve” — systematically absent in formal writing, omnipresent in informal speech.
Colloquial vocabulary: “loads of” (many), “a bit” (slightly), “hang out” (spend time socially), “stuff” (things), “get,” “kind of” — unmarked in casual contexts but out of place in formal ones.
Phrasal verbs: Informal register strongly prefers phrasal verbs over single-word Latinate synonyms — “look into” over “investigate,” “put up with” over “tolerate.”
Ellipsis and fragments: “Coming tonight?” (not “Are you coming tonight?”); “Sounds good” (not “That sounds good to me”).
Vague language: “Things,” “stuff,” “around,” “sort of,” “kind of,” “like” — vague forms are markers of informal conversational style.
Discourse particles: “You know,” “I mean,” “like,” “right” — interactional markers that manage conversational flow.
Why Informal Language Is Hard to Acquire
Input gap: Formal textbook dialogues are often stilted and inauthentic, not reflecting real informal speech. Learners who rely on textbooks lack exposure to casual native-speaker interaction patterns.
Cultural density: Much informal language — especially humor, irony, references, and social rituals — is culturally dense. Understanding “that’s such a Karen thing to do” requires cultural knowledge, not just vocabulary.
Register mismatch errors: Learners who successfully deploy formal language may awkwardly transpose it into casual contexts (“I was much fatigued after the excursion to the shopping precinct”) — producing language that is grammatically correct but socially abnormal.
Informal Written Language
Digital communication (texting, social media, online chat) has generated distinctive informal written registers that blend spoken and written features. Abbreviations, emoji, deliberate spelling deformations, and discourse markers are now canonical features of informal written communication.
History
Labov (1966): The Social Stratification of English in New York City — foundational documentation of style-shifting between formal and informal varieties.
Biber (1988): Variation Across Speech and Writing — corpus-based multi-feature analysis of register differences.
Carter & McCarthy (2006): Cambridge Grammar of English — systematic grammar of spoken (primarily informal) English.
Common Misconceptions
“Informal language is simply incorrect formal language.” Informal registers are governed by systematic rules and conventions that differ from formal registers — they are not degraded or erroneous versions of formal language. Contractions, ellipsis, pragmatic particles, and colloquial vocabulary follow consistent patterns within informal registers. Describing informal language as “incorrect” misapplies formal register norms to contexts where they do not apply, reflecting prescriptive rather than descriptive linguistic understanding.
“Using informal language shows disrespect.” Register appropriateness is context-dependent: using informal language in contexts that call for informality (casual conversation with friends, informal messaging, social media) is appropriate and socially skilled. Using formal language in informal contexts can itself be socially inappropriate (sounding overly stiff, distant, or condescending). Mastering both registers and knowing when to use each reflects high communicative competence.
Criticisms
Teaching informal language in L2 instruction has been criticized for the lag between classroom materials and authentic informal registers — many course materials use formal or semi-formal language that does not represent the conversational registers L2 learners encounter in real social interaction. Learners who develop proficiency primarily through formal classroom input may sound inappropriately formal in casual conversational contexts and may miscomprehend native speaker informal speech. The challenge of defining the boundary between informal and non-standard language (slang, dialect features, taboo language) creates pedagogical decisions about how much “authentic” informal language to include in instruction.
Social Media Sentiment
Informal language instruction is a high-demand area in online language learning communities — learners frequently express frustration that classroom/textbook language does not match what they encounter in media, conversation, or online. “Real spoken Japanese/Spanish/French” content is a popular category of YouTube and podcast content specifically targeting the gap between textbook language and informal native speech. Community discussions of specific informal features (contractions, filler words, casual grammar shortcuts, internet/texting language) are perennial learner questions.
Last updated: 2026-04
Practical Application
- Get informal-register input through media and conversation — native-speaker podcasts, TV shows, films, social media, and online conversations are primary sources of authentic informal language input; textbooks alone are insufficient.
- Log informal vocabulary items and phrases — colloquialisms, phrasal verbs, and informal idioms that you encounter in media should be added to your vocabulary system for review, just as formal vocabulary would be.
Related Terms
See Also
- Formal Language — The contrasting register at the other end of the formality spectrum
- Slang — The most informal and ephemeral sub-register
- Phrasal Verb — Characteristically informal vocabulary items
- Sakubo
Research
Halliday, M. A. K. (1978). Language as Social Semiotic: The Social Interpretation of Language and Meaning. Edward Arnold.
The foundational account of register theory in functional linguistics — analyzing how language systematically varies with social context, including the informal-formal register dimension, through the concepts of field, tenor, and mode.
Biber, D., & Conrad, S. (2009). Register, Genre and Style. Cambridge University Press.
A corpus-based treatment of register variation, providing extensive empirical description of how language features systematically differ across registers including conversation (informal) vs. academic writing (formal) — the key empirical reference for register variation in English.
McCarthy, M., & Carter, R. (1994). Language as Discourse: Perspectives for Language Teaching. Longman.
An analysis of spoken language grammar and its implications for language teaching, arguing that informal spoken language has systematic grammatical properties that differ from written formal norms and should be explicitly addressed in L2 instruction.