cogency
convincingness
power
powerfulness
persuade
persuasive
persuasively
acumen
adroitness
astuteness
benignity
cleanness
considerateness
double-talk
fervency
finesse
fluency
forethought
graciousness
heartiness
impressiveness
intrepidity
kindliness
lucidity
playfulness
promptitude
resourcefulness
succinctness
sureness
thoughtfulness
urbanity
verve