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irregular (EN)
прилагательное, существительное

прилагательное “irregular”

основа irregular (more/most)
  1. нерегулярный
    Her heartbeat was irregular, speeding up and slowing down unpredictably.
  2. странный
    What the accountant is doing seems very irregular.
  3. неровный
    The path through the woods was irregular, making it difficult to walk without tripping.
  4. неправильный (в грамматическом контексте)
    The verb "to go" becomes "went" in the past tense, making it an irregular verb.
  5. неправильный (в геометрическом контексте)
    The shape of the plot was irregular, with one side noticeably longer than the others.

существительное “irregular”

ед. irregular, мн. irregulars
  1. партизан
    During the conflict, the village was defended by a group of irregulars who knew the terrain better than the invading army.
  2. случайный посетитель
    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.