of diplomacy; tactful

politic, tactful

using any means to get what one wants and not caring about morality etc

scheming

a piece of ground (usually small); a (secret) plan (good or bad) (to do something)

plan, scheme

not to be trusted

deceitful, untrustworthy

deceitful; keeping or doing things secretly

clever, devious

secret; vague

sly

not trustworthy

not dependable, unfaithful