subtle >> ˈsʌt(ə)l
Definition: [adjective] (especially of a change or distinction) so delicate or precise as to be difficult to analyse or describe.
Example: his language expresses rich and subtle meanings
Definition: [adjective] making use of clever and indirect methods to achieve something.
Example: he tried a more subtle approach
Definition: [adjective] crafty; cunning.
Example: the subtle fiend dissembled