precipitant

Noun
  1. An agent that causes a precipitate to form (synset 115021960)
Adjective
  1. Done with very great haste and without due deliberation (synset 301273978)
    "hasty marriage seldom proveth well"; "hasty makeshifts take the place of planning"; "rejected what was regarded as an overhasty plan for reconversion"; "wondered whether they had been rather precipitate in deposing the king"

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