having or exerting influence, esp. great influence; powerful; influential.

having an effect or producing a definite or desired result; effective.

capable of achieving the desired end by trickery or craft; crafty.

a man or thing having or exerting influence, esp. great influence; a powerful or influential person or thing.

a thing, as a medicine, having an effect or producing a definite or desired result.

a man capable of achieving the desired end by trickery or craft; a crafty man.