Synonyms of the word 
IMPERFECTLY → AMISS
imperfectly
- adv. In an imperfect manner or degree; not fully or completely.
amiss
- adj. Wrong; faulty; out of order; improper or otherwise incorrect.
- adv. Mistakenly, wrongly.
- n. (obsolete) Fault; wrong; an evil act, a bad deed.
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