spur–of–the–moment

adjective

: done suddenly and without planning

Full Definition of SPUR-OF-THE-MOMENT

: occurring or developing without premeditation : hastily extemporized <a spur–of–the–moment decision>

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1948

Synonyms: ad hoc, ad-lib, down and dirty, extemporary, extempore, impromptu, improvisational, improvised, offhand, offhanded, off-the-cuff, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied

Antonyms: considered, planned, premeditated, premeditative, prepared, rehearsed

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