Discretion (noun) اختیار، صوابدید

the quality of behaving or speaking in such a way as to avoid causing offence or revealing confidential information.
Example: “she knew she could rely on his discretion”
Subtle (adjective) سبک، سمجھ سے بالاتر

(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”