of diplomacy; tactful

politic, tactful

causing strong feelings of pleasure, interest etc

inspiring, exhilarating

holding one's attention or interest

absorbing

of, characteristic of, impressionism

suggestive

doing harm secretly or unseen

sneaky, tricky

of great interest

fascinating, gripping

deceitful; keeping or doing things secretly

clever, devious

secret; vague

sly

cunning (the usual word)

crafty, clever