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1. Not occurring at a regular rate or fixed intervals
   "an irregular heartbeat";
   - unpredictable
    
2. Failing to meet a standard of manufacture due to an imperfection
   "an irregular pair of jeans"
    
3. Deviating from normal expectations; somewhat odd, strange, or abnormal
   "highly irregular behaviour";
   - atypical
    
4. Lacking continuity or regularity
   "an irregular worker";
   - temporary
    
5. (of a surface or shape); not level or flat or symmetrical
   "walking was difficult on the irregular cobblestoned surface"
    
6. Independent in behaviour or thought
   "she led a somewhat irregular private life";
   - maverick, unorthodox
    
7. Contrary to rule or accepted order or general practice
   "irregular hiring practices"
    
8. (used of the military) not belonging to or engaged in by regular army forces
   "irregular troops"; "irregular warfare"
    
9. (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement

1. A member of an irregular armed force that fights a stronger force by sabotage and harassment
   - guerrilla, guerilla, insurgent
    
2. Merchandise that has imperfections; usually sold at a reduced price without the brand name
   - second

Derived forms: irregulars

See also: abnormal, asymmetric, asymmetrical, casual, crooked, illegal, imperfect, improper, occasional, part time, partisan, partizan, part-time, randomised [Brit], randomized, regularity, rough, sporadic, strong, unconventional, uneven, unlawful, unnatural, unrhythmic, unrhythmical, unsmooth, unsteady, unsystematic

Type of: merchandise, product, ware, warrior

Antonym: regular

Part of: guerilla force, guerrilla force

Encyclopedia: Irregular