IPA: /prɪˈsɪpɪtɪnəs/
KK: /prɪˈsɪpɪtɪnəs/
The quality or state of acting quickly and without careful thought.
His precipitateness in making decisions often led to mistakes.
Precipitateness → It is formed from "praecipitare" (meaning to throw down) and the suffix "-ness" (meaning the state or quality of). The word refers to the quality of being hasty or rash, as if one is thrown down into action without careful thought.
Think of being 'thrown down' ('praecipitare') into a situation without thinking — that's why precipitateness means acting hastily.
No commonly confused words.