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1.
Describes someone who reacts to criticism by becoming quiet and withdrawn. As opposed to explosive, which means that they "explode" into anger.

Usually introverts are implosive and extroverts are explosive, but neither of those are a rule.
Bob: You made a mistake over here.
Bill: (Silence)
Bob: Feeling implosive today, are we?
by Al Benedict June 15, 2011