adverb
modifies a verb, adjective, or other adverb to indicate inadequacy or insufficiency
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The report was inadequately prepared and did not meet the standards set by the board.
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She was inadequately dressed for the formal event and felt out of place.
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The teacher's explanation was so inadequately done that none of us understood the lesson.
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His apology felt inadequately sincere, leaving her feeling doubtful about his intentions.