irregular

(noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment. Synonyms: guerrilla, guerilla, insurgent.

(noun) merchandise that has imperfections; usually sold at a reduced price without the brand name. Synonyms: second.

(adj) contrary to rule or accepted order or general practice. Synonyms: irregular (vs. regular). Examples: "Irregular hiring practices."

(adj) not occurring at expected times. Synonyms: unpredictable.

(adj) (used of the military) not belonging to or engaged in by regular army forces. Synonyms: irregular (vs. regular). Examples: "Irregular troops." "Irregular warfare."

(adj) (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement. Synonyms: irregular (vs. regular).

(adj) falling below the manufacturer's standard. Examples: "Irregular jeans."

(adj) deviating from normal expectations; somewhat odd, strange, or abnormal. Synonyms: atypical. Examples: "These days large families are atypical." "Atypical clinical findings." "Atypical pneumonia." "Highly irregular behavior."

(adj) lacking continuity or regularity. Synonyms: temporary. Examples: "An irregular worker." "Employed on a temporary basis."

(adj) (of a surface or shape); not level or flat or symmetrical. Examples: "Walking was difficult on the irregular cobblestoned surface."

(adj) independent in behavior or thought. Synonyms: maverick, unorthodox. Examples: "She led a somewhat irregular private life." "Maverick politicians."