The phrase "quick on the trigger" is an idiom that refers to someone who is fast to react or respond to something. Its antonyms are words that describe the opposite behavior or attitude. Some antonyms for "quick on the trigger" include cautious, hesitant, indecisive, slow, deliberate, thoughtful, careful, and patient. These words are used to describe someone who takes their time to make a decision, who is cautious and thoughtful about their actions, and who avoids reacting impulsively. While being quick on the trigger can sometimes be an advantage, it is important to balance it with caution and thoughtfulness to avoid making hasty or impulsive decisions.