1. (a.) Directed back; attended by reflection; retroactive; introspective.

2. (a.) Produced in reaction, in resistance, or in return.

3. (a.) Of, pertaining to, or produced by, stimulus or excitation without the necessary intervention of consciousness.

4. (n.) Reflection; the light reflected from an illuminated surface to one in shade.

5. (n.) An involuntary movement produced by reflex action.

6. (v. t.) To reflect.

7. (v. t.) To bend back; to turn back.

Pavlovian conditioning action and reaction adumbration answer antiphonal arch automatic automatic reaction automatic response autonomic reaction back backlash backward backwash behavior bend bend back blind blind impulse bounceback bow brain wave brainstorm casual clout compulsive conditioned conditioned response conditioning counter crook curl curve decurve deflect dome drive echo embow fancy flash fleeting impulse flex force forced gut gut response hook hump hunch ill-advised ill-considered ill-devised impact impress impression imprint impulse impulsive inadvertent incurvate incurve indeliberate inflect inspiration instinct instinctive instrumental conditioning involuntary involuntary impulse loop mark mechanical natural impulse negative reinforcement notion operant conditioning outline positive reinforcement predictable response print psychagogy quick hunch reacting reaction reactionary reactive recoil recurve reeducation reflect reflection reflex action reflexive refluence refluent reflux reinforcement reorientation repercussion reply respondence respondent responding response responsive retroaction retroactionary retroactive retroflex return reverberation reversed revulsion revulsive rise round sag shadow silhouette snap spontaneous sudden thought swag sweep turn turned around unadvised uncalculated unconditioned reflex unconscious unconsidered undeliberate undeliberated undesigned unintended unintentional unmeditated unpremeditated unstudied unthinking unthinking response unwilled unwilling unwitting urge vault wind wrong-way wrong-way around