WordWeb Online

1. Markedly effective as if by emotional pressure
   "impelling skill as a teller of tales"; "an impelling personality"

1. Urge or force (a person) to an action; constrain or motivate
   - force
    
2. Cause to move forward with force
   "Steam impels this ship"
   - propel

See also: effective, effectual, efficacious, impellent, impeller, impulsion, impulsive

Type of: cause, displace, do, engender, make, move