irregular

adjective

1
not occurring at expected times
2
independent in behavior or thought
she led a somewhat irregular private life
maverick politicians
3
(of a surface or shape); not level or flat or symmetrical
walking was difficult on the irregular cobblestoned surface
4
lacking continuity or regularity
an irregular worker
employed on a temporary basis
5
deviating from normal expectations; somewhat odd, strange, or abnormal
these days large families are atypical
atypical clinical findings
6
falling below the manufacturer's standard
irregular jeans
7
contrary to rule or accepted order or general practice
irregular hiring practices
8
(of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
9
(used of the military) not belonging to or engaged in by regular army forces
irregular troops
irregular warfare

1
merchandise that has imperfections; usually sold at a reduced price without the brand name
2
a member of an irregular armed force that fights a stronger force by sabotage and harassment

Also useful for “irregular”:Unscrambler— Rearrange the letters in “irregular”