motive, need, motivating, impetus, inspiration, incentive, desire, ambition, encouragement, demotivation, more...

apathy, lethargy, indifference, discouragement, inertia

intrinsic, extrinsic, positive, negative, more...

intrinsic, human, primary, strong, high, extrinsic, political, main, personal, individual, economic

driving factor,   spurs to action,   actor's goal,   inspiring force,   drive obsession,   driving factors,   strong drive,   desire to do,   subconscious desire,   driving need