ad hoc, ad-lib, extemporaneous, extemporary, extempore, impromptu, improvisational, improvised, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied;
OFF-THE-CUFF Defined for English Language Learners
Definition of off-the-cuff for English Language Learners
: not prepared in advance : done without planning or preparation
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