irregular

independent in behavior or thought

“she led a somewhat irregular private life”

not belonging to or engaged in by regular army forces

“irregular troops”

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

not occurring at a regular rate or fixed intervals

“an irregular heartbeat”

merchandise that has imperfections; usually sold at a reduced price without the brand name

deviating from normal expectations; somewhat odd, strange, or abnormal

“highly irregular behavior”

a member of an irregular armed force that fights a stronger force by sabotage and harassment

lacking continuity or regularity

“an irregular worker”

contrary to rule or accepted order or general practice

“irregular hiring practices”

failing to meet a standard of manufacture due to an imperfection

“an irregular pair of jeans”