irregular

Meanings

1. 1
   adj

   Not happening at equal or expected times

   He has irregular working hours that change every week.

2. 2
   adj

   Not even or smooth in shape or arrangement

   The coastline had an irregular, jagged edge.

3. 3
   adj

   Not following the usual rules of grammar

   "Children" and "feet" are irregular plurals.

4. 4
   adj

   Against the usual rules or accepted way of doing things

   The company was accused of irregular hiring practices.

From Middle English irreguler, from Old French irreguler, from Medieval Latin or Late Latin irrēgulāris, from in- + regularis, equivalent to ir- + regular.

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