"impelling" in the verb sense
1. impel, force
urge or force (a person) to an action constrain or motivate
2. propel, impel
cause to move forward with force
"Steam propels this ship"
"impelling" in the adjective sense
1. impelling
markedly effective as if by emotional pressure
"impelling skill as a teller of tales"
"an impelling personality"
Source: WordNet® (An amazing lexical database of English)
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