Precipitant
Part of speech: adjective
Definition: That falls headlong, or causes a headlong fall Rash or impulsive Sudden or unexpected That causes precipitation
Part of speech: noun
Definition: A substance that forms a precipitate when added to a solution
Hasty
Part of speech: adjective
Definition: Acting in haste; being too hurried or quick. (e.g. Without much thinking about it they made a hasty decision to buy it.)
Example sentence: The being without an opinion is so painful to human nature that most people will leap to a hasty opinion rather than undergo it.