"Quick on trigger" refers to individuals who are responsive and prompt in their actions. The term signifies being prompt and agile in making decisions. Antonyms for "quick on trigger" would include words such as sluggish, slow, inactive, or inert. The opposite of being quick on trigger is being indecisive, passive or lethargic. People who display such traits tend to be slow and uncertain in their decision-making process. They require more time to formulate and execute a plan of action. In contrast, those who are quick on trigger tend to be more effective and efficient in their approach, enabling them to achieve their goals faster.