irregular
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/ɪˈreɡjələr/
🇬🇧
/ɪˈreɡjələ(r)/
not even or smooth in shape or pattern
The stone had an irregular surface that was not smooth.
not happening at regular times
Her sleep schedule was irregular and changed often.
not following the usual rules
The teacher said it was irregular to turn in homework late.
not formed in the normal way
In English, 'go' becomes 'went' in the past tense, which is irregular.
not part of the official army
The irregular troops fought without official orders.
a soldier not in the official army
The irregular joined the fight without being part of the army.