An archaic form of 'subtle'; not obvious; difficult to detect.

सूक्ष्म

English Usage: His plans were full of subtile strategies that went unnoticed by others.

Hindi Usage: उसकी योजनाएँ सूक्ष्म रणनीतियों से भरी थीं जो दूसरों द्वारा अनजान थीं।

Faint or elusive; delicate in meaning or intention.

दृष्टिहीन

English Usage: There was a subtile difference in the shades of paint that only she could perceive.

Hindi Usage: पेंट के रंगों में एक दृष्टिहीन अंतर था जिसे केवल उसने देखा।