irregular
adjective
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not occurring at expected timesunpredictable
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independent in behavior or thought“They led a somewhat irregular private life.”maverickunorthodox
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(of a surface or shape)
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lacking continuity or regularity“an irregular worker”temporary
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deviating from normal expectationsatypical
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falling below the manufacturer's standard“irregular jeans”
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contrary to rule or accepted order or general practice“irregular hiring practices”
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(of solids) not having clear dimensions that can be measured
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(used of the military) not belonging to or engaged in by regular army forces“irregular troops”
noun
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merchandise that has imperfectionssecond
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a member of an irregular armed force that fights a stronger force by sabotage and harassmentguerrilla