unpremeditated
[adjective]
Synonyms: spontaneous, automatic, impulsive, instinctive, involuntary, unmeditated, unprompted, will-less, unintentional, inadvertent, undesigned, undevised, unintended, unplanned, unpurposed, unthought

---

Antonyms: premeditated

[TahlilGaran] English Synonym Dictionary ▲

unpremeditated adjective

1. (of a crime or bad action) not planned in advance Antonym : premeditated

[TahlilGaran] English Dictionary ▲