"irregular" in the noun sense

1. guerrilla, guerilla, irregular, insurgent

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

2. irregular, second

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

"irregular" in the adjective sense

1. irregular

contrary to rule or accepted order or general practice

"irregular hiring practices"

2. irregular, unpredictable

not occurring at a regular rate or fixed intervals

"an irregular heartbeat"

3. irregular

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

"irregular troops"

"irregular warfare"

4. irregular

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

5. irregular

failing to meet a standard of manufacture due to an imperfection

"an irregular pair of jeans"

6. atypical, irregular

deviating from normal expectations somewhat odd, strange, or abnormal

"these days large families are atypical"

"atypical clinical findings"

"atypical pneumonia"

"highly irregular behavior"

7. irregular, temporary

lacking continuity or regularity

"an irregular worker"

"employed on a temporary basis"

8. irregular

of a surface or shape not level or flat or symmetrical

"walking was difficult on the irregular cobblestoned surface"

9. irregular, maverick, unorthodox

independent in behavior or thought

"she led a somewhat irregular private life"

"maverick politicians"

Source: WordNet® (An amazing lexical database of English)

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