Antonyms of adj proactive

2 senses of proactive

Sense 1
proactive (vs. retroactive) -- (descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently; "proactive inhibition"; "proactive interference")

retroactive (vs. proactive) -- (descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously)

Sense 2
proactive -- ((of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens)

INDIRECT (VIA active) -> passive, inactive -- (lacking in energy or will; "Much benevolence of the passive order may be traced to a disinclination to inflict pain upon oneself"- George Meredith)

Similarity of adj proactive

2 senses of proactive

Sense 1
proactive (vs. retroactive) -- (descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently; "proactive inhibition"; "proactive interference")

Sense 2
proactive -- ((of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens)
       => active (vs. passive) -- (disposed to take action or effectuate change; "a director who takes an active interest in corporate operations"; "an active antagonism"; "he was active in drawing attention to their grievances")