irregular adj.

1 not regular in size/shape/frequency

VERBS be, look | become

ADV. highly, very | rather, slightly, somewhat The cells are slightly irregular in shape.

2 not allowed according to the rules

VERBS be, seem, sound

ADV. highly, most, very It would be highly irregular for a police officer to accept money in this way. | slightly, somewhat some somewhat irregular business practices

You can also check Google Dictionary: irregular (English, 中文解释 )

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