telling

[1]	relation , recounting
[2]	apprisal , tattling , (too) revealing , notification , (Colloq) letting the cat out of the bag , giving away the whole show
[3]	tattle , singing

adj.

[1]	effective , effectual , influential , weighty , important , powerful , forceful , potent , significant , considerable , striking
[2]	revealing , telltale
[3]	cogent , weighty
[4]	impressive