irregular

1 irregular /ɪˈrɛgjəlɚ/ adjective
1 irregular
/ɪˈrɛgjəlɚ/
adjective
Britannica Dictionary definition of IRREGULAR
1 
[more irregular; most irregular] : not normal or usual : not following the usual rules about what should be done
2 
[more irregular; most irregular] : not even or smooth : not regular in form or shape
3 
[more irregular; most irregular]
a  : happening or done at different times that change often
b  : not happening at times that are equally separated
4 
grammar : not following the normal patterns by which word forms (such as the past tenses of verbs) are usually created
5 
US : not able to have normal bowel movements : constipated
6 
: not belonging to a country's official army

— irregularly

adverb
2 irregular /ɪˈrɛgjəlɚ/ noun
plural irregulars
2 irregular
/ɪˈrɛgjəlɚ/
noun
plural irregulars
Britannica Dictionary definition of IRREGULAR
[count]
: a soldier who does not belong to a country's official army