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Definition of irregular
1not even or balanced in shape or arrangement:her features were too irregular occurring at uneven or varying rates or intervals:an irregular heartbeat Botany (of a flower) having the petals differing in size and shape; zygomorphic. 2contrary to the rules or to that which is normal or established:they were questioned about their involvement in irregular financial dealings [attributive] (of troops) not belonging to regular or established army units. Grammar (of a verb or other word) having inflections that do not conform to the usual rules.
noun (usually irregulars)
1a member of an irregular military force. 2an imperfect piece of merchandise sold at a reduced price.
and the related word irregularity
with a double r
at the beginning.