► impulsivesomeone who is impulsive does things without considering the possible problems or dangers first: He’s always making impulsive decisions about buying expensive things. These children tend to be impulsive and restless.
► rash if you do something rash, you do something dangerous or stupid without thinking carefully first. You can also say that a person who behaves like this is rash: Don’t make any rash decisions! You’re being rash – you don’t have to quit your job because of this.
► spontaneous a spontaneous activity, especially a good activity, is done suddenly, without planning it first. You can also use spontaneous about a person: They began a spontaneous game of hide-and-seek.
► impetuous formal someone who is impetuous often does things quickly because of his or her feelings, rather than thinking carefully first. Actions or decisions can also be impetuous: He is young and impetuous, and should not have been sent to deal with such a difficult situation.
► hasty a hasty action or decision is done too quickly, and usually has bad results: I was hasty in making my decision, and now I regret it.
► precipitate formal precipitate actions or decisions are made or done too quickly, without considering everything first: Perhaps I was too precipitate in my judgment.
► hotheaded someone who is hotheaded gets angry or excited easily and does things too quickly, without thinking: Two hotheaded teenagers got into a fight over a girl.