irregular

contrary to rule or accepted order or general practice

• “irregular hiring practices”

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

not occurring at expected times

used of the military; not belonging to or engaged in by regular army forces

• “irregular troops”
• “irregular warfare”

deviating from what is usual or common or to be expected; often somewhat odd or strange

• “these days large families are atypical”
• “highly irregular behavior”

lacking continuity or regularity

• “an irregular worker”
• “employed on a temporary basis”

of a surface; not level or flat

• “walking was difficult on the irregular cobblestoned surface”

used of independent armed resistance forces

• “guerrilla warfare”
• “partisan forces”

independent in behavior or thought

• “she led a somewhat irregular private life”
• “maverick politicians”

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

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