WordWeb Online

1. Devoid of importance, meaning, or force
   - unimportant
    
2. Signifying nothing
   "insignificant sounds"
    
3. Of little importance, influence or power; of minor status
   "a minor, insignificant bureaucrat";
   - peanut
    
4. Small and unimpressive
   "an insignificant sum of money";
   - dinky [informal]

See also: flimsy, fragile, hole-and-corner, hole-in-corner, inappreciable, light, little, meaningless, minor, nonmeaningful, significance, slight, small, superficial, tenuous, thin, trivial, unimportant

Antonym: important

Encyclopedia: Insignificant