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English definition of “imperfect”

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imperfect

adjective uk   /ɪmˈpɜː.fekt/ us    /-ˈpɝː-/

imperfect adjective (NOT PERFECT)

C1 damaged, containing problems, or not having something: We're living in an imperfect world. I explained as well as I was able, given my own imperfect understanding of the situation.

imperfect adjective (GRAMMAR)

specialized language The imperfect form of a verb describes an action in the past that was continuous or was not completed: In the sentence "He was hit by a car as he was crossing the road", the verb "cross" is in the imperfect form.
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imperfectly
adverb uk   /-li/ us  

imperfect

noun [S] uk   /ɪmˈpɜː.fekt/ us    /-ˈpɝː-/
the imperfect specialized in some languages, the form of a verb that is used for an action that has not been completed in the past, used, for example, to refer to an action that was happening when it was suddenly interrupted, or to describe an existing situation at the beginning of a story: In the sentence "He was hit by a car as he was crossing the road", the verb "cross" is in the imperfect.
(Definition of imperfect from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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