irregular (EN)

adjective, noun

adjective “irregular”

1. (of an action happening in time) not at regular intervals
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   Her heartbeat was irregular, speeding up and slowing down unpredictably.
2. (of an activity) odd, suspicious
   What the accountant is doing seems very irregular.
3. (of a surface) not smooth
   The path through the woods was irregular, making it difficult to walk without tripping.
4. in grammar, a word that does not follow the usual rules of inflection
   The verb "to go" becomes "went" in the past tense, making it an irregular verb.
5. in geometry, a shape with sides of different lengths or angles of different sizes
   The shape of the plot was irregular, with one side noticeably longer than the others.

noun “irregular”

1. a soldier not part of an official army
   During the conflict, the village was defended by a group of irregulars who knew the terrain better than the invading army.
2. a person who does not frequently visit a particular place
   At the weekly book club meetings, it's easy to spot the irregulars because they often have to ask for updates on the group's discussions.