Synonyms of ad hoc

ad hoc

adjective

as in impromptu

made or done without previous thought or preparation

upon learning that it was her birthday, we had an ad hoc celebration right there in the restaurant

Synonyms & Similar Words

• impromptu
• improvised
• improvisational
• unprepared
• down and dirty
• spur-of-the-moment
• extemporaneous
• unauthorized
• extemporary
• informal
• offhand
• unstudied
• unplanned
• unrehearsed
• extempore
• unconsidered
• snap
• spontaneous
• automatic
• unpremeditated
• off-the-cuff
• offhanded
• ad-lib
• impulsive
• unscripted
• instinctive
• involuntary
• casual
• cursive
• ill-advised
• half-baked
• half-cocked

Antonyms & Near Antonyms

• prepared
• planned
• considered
• rehearsed
• premeditated
• premeditative
• intentional
• intended
• deliberate

Example Sentences

Recent Examples of ad hoc

Advisory councils and ad hoc committees of external scientists approve new research priorities, provide a second-level review of grants, and advise the agency in setting scientific directions. — Mark Histed, The Atlantic, 17 June 2026

With no way to secure this crucial boundary, Microsoft and its peers are left to erect complicated and ad hoc guardrails designed to rein in the consequences of this incurable gullibility. — Dan Goodin, ArsTechnica, 16 June 2026

An ad hoc subcommittee consisting of board members Kevin Hastings, Tracy Dezenzo and Greg Diamond was formed June 2 to consolidate and expand last year’s recommendations to be presented to the full board for possible adoption at its meeting Tuesday, July 7. — Steven Mihailovich, San Diego Union-Tribune, 9 June 2026

Enter Jimmy Cialella and John Denisi, who renovated the deli and formalized Phil’s formerly ad hoc menu with Jake Santini, a Southwest Philly savant. — Adam Erace, Bon Appetit Magazine, 8 June 2026

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