off-the-cuff

Synonyms

ad hoc, ad-lib, extemporaneous, extemporary, extempore, impromptu, improvisational, improvised, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied;

Antonyms

considered, planned, premeditated, premeditative, prepared, rehearsed;

Near Antonyms

deliberate, intended, intentional;

Related Words

unscripted;

automatic, impulsive, instinctive, involuntary, spontaneous;

casual, cursive, informal, unauthorized;

half-baked, half-cocked, ill-advised;