Short-fuse is a term used to describe someone who loses their temper very quickly. The antonyms of short-fuse are patient, composed, and tolerant. A patient person is someone who endures minor setbacks or difficulties without getting upset. A composed person is someone who maintains their cool, even in the face of adversity. Lastly, a tolerant person is someone who accepts and respects differences in others without getting angry or upset. These are all qualities of a person who has a long-fuse and can handle situations calmly and rationally. In any situation, it is always better to be patient, composed, and tolerant, rather than having a short-fuse.