"overhasty" in the adjective sense
1. hasty, overhasty, precipitate, precipitant, precipitous
done with very great haste and without due deliberation
"hasty marriage seldom proveth well"- Shakespeare
"hasty makeshifts take the place of planning"- Arthur Geddes
"rejected what was regarded as an overhasty plan for reconversion"
"wondered whether they had been rather precipitate in deposing the king"
Source: WordNet® (An amazing lexical database of English)
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