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What is the opposite of formal?

Need antonyms for formal? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of characterized by conventional forms of ceremony and behavior
“Not one for pomp, Harry was grateful that the occasion was rather informal.”
Adjective
Opposite of poised or dignified in style, tone, or form
“Barry mumbled his way through a messy and ineloquent speech about his troubled childhood.”
Adjective
(of a person) Opposite of strictly conventional in one's manner or behavior
“She was elegant and bookish, while he was casual and endearingly laid-back.”
Adjective
Opposite of of or denoting a style of writing or speaking characterized by more elaborate or technical grammatical structures
“The word is perceived as colloquial in nature, inappropriate for formal conversation.”
Adjective
Opposite of having a conventionally recognized form, structure, or set of rules
“The group underwent an unconventional training program that raised eyebrows among pundits.”
Adjective
Opposite of officially sanctioned or recognized
“The discussion was based on unofficial documents and conversations with those familiar with the subject.”
Adjective
Opposite of being, or existing as, something in name only
“Nick is the actual brains behind the operation.”
Adjective
Opposite of relating to, or requiring the wearing of, elegant dress
“Invitees are advised to dress in casual wear for the event.”
Adjective
Opposite of not friendly or sociable
“In fact, I can even be friendly to him, because I know he's not a bad person, and we do have a lot in common.”
Adjective
Opposite of marked by charm, confidence and elegance
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Adjective
Opposite of slow to reveal emotion or opinions
Adjective
Opposite of having the approval or authorization of an authority or public body
Adjective
Opposite of overly formal, conventional, or prim and proper
Adjective
Opposite of vehement or impassioned in expression, sometimes pretentiously so
Adjective
Opposite of easily offended or shocked, especially by sexual matters
Adjective
Opposite of suited or acceptable to the purpose or circumstances
Improper use of gym equipment can result in injury.”
Adjective
Opposite of legally binding due to having been executed in compliance with the law
“He's been detained in Japan since mid-July, when he was nabbed for traveling with an invalid passport.”
Adjective
Opposite of exact in correspondence or adherence to something
“For the kids, the rules can probably be adhered to in a loose manner.”
Adjective
Opposite of pertaining to points, lines, angels and figures used in geometry
Adjective
Opposite of boring or severely lacking in interest
Adjective
Opposite of intended to teach, particularly in having moral instruction as an ulterior motive
Adjective
Opposite of well-defined
Adjective
Opposite of having a calm and serious manner or disposition
“He was still tense and agitated, and the view did nothing to calm him down.”
Adjective
Opposite of suited or acceptable to the purpose or circumstances
“Given the circumstances surrounding the tragedy, it was a particularly imprudent thing to say.”
Adjective
Opposite of trendy or fashionable
“He wore baggy, rainbow-colored pants that were highly unfashionable.”
Adjective
Opposite of pertaining to liturgy
Adjective
Opposite of characterized by deep sincerity
“Dante seethed at the insult but Vaughn gave a halfhearted apology.”
Noun
Opposite of a gathering of a social nature
“After the fall of the Starks, a feud befell the different Houses in the North.”
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