Synonyms for irregular

adjective

• independent in behavior or thought
• not occurring at a regular rate or fixed intervals
• deviating from normal expectations; somewhat odd, strange, or abnormal
• lacking continuity or regularity
• contrary to rule or accepted order or general practice
• failing to meet a standard of manufacture due to an imperfection
• (of a surface or shape); not level or flat or symmetrical
• (used of the military) not belonging to or engaged in by regular army forces

noun

• merchandise that has imperfections; usually sold at a reduced price without the brand name
• a member of an irregular armed force that fights a stronger force by sabotage and harassment

• (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement