The opposite of "Reactive".

Often used instead of "active", which means the same thing but evidently has too few syllables.
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ProActive means pseudo-active. See DilbertMoment.

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Actually, no. ProActive means that when things start to go wrong, you take early, thoughtful, directed action (not just ''any'' action, and not 
''late'' action) to get them back on track. While I won't support the etymology, there's a useful distinction embodied in the term.

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I thought it was an active that lost its amateur status....