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Related to spur-of-the-moment: come off, in favor of, in the first place, On a par, give rise to, in line with, pat on the back
Occurring or made hastily on impulse: a spur-of-the moment choice.
sudden and unplanned
occurring or done without preparation or deliberation; impulsive: a spur-of-the-moment decision.
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|Adj.||1.||spur-of-the-moment - in response to an unforeseen need; "a spur-of-the-moment party"|
unprepared - without preparation; not prepared for; "unprepared remarks"; "the shock was unprepared"; "our treaty makers approached their immensely difficult problems unprepared"- R.E.Danielson