(adj): irregular in shape or outline
(adj): occurring from time to time
(adj): not conforming to legality, moral law, or social convention
(adj): set up or distributed in a deliberately random way
(adj): of verbs not having standard (or regular) inflection
(adj): not occurring at expected times
(adj): vs. continual) -- (recurring in scattered and irregular or unpredictable instances
(adj): vs. regular) -- ((used of the military) not belonging to or engaged in by regular army forces
(adj): vs. regular) -- ((of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
(adj): falling below the manufacturer's standard
(adj): vs. perfect) -- (not perfect; defective or inadequate
(adj): deviating from normal expectations; somewhat odd, strange, or abnormal
(adj): vs. normal), unnatural -- (not normal; not typical or usual or regular or conforming to a norm
(adj): lacking continuity or regularity
(adj): vs. full-time), parttime -- (involving less than the standard or customary time for an activity
(adj): (of a surface or shape); not level or flat or symmetrical
(adj): vs. even) -- (not even or uniform as e.g. in shape or texture
(adj): independent in behavior or thought
(adj): vs. conventional) -- (not conforming to accepted rules or standards
(n): a member of an irregular armed force that fights a stronger force by sabotage and harassment
(n): someone engaged in or experienced in warfare
(n): merchandise that has imperfections; usually sold at a reduced price without the brand name
(n): commodities offered for sale
Haha!
I don't have a list to add this word to, but I came across a vaguely amusing usage today:
"Very early in their recapitulation of the imperfect subjunctive of the irregular verb stare Mrs Fielding saw with alarm that her pupil's conduct was likely to grow even more irregular than her verb."
--Patrick O'Brian, Treason's Harbour, 63-64