When subtle came to first be used in Middle English its meaning was very much in this same lineage. It meant "perceptive, refined," and was used to describe people known for their clear …

SUBTLE definition: 1. not loud, bright, noticeable, or obvious in any way: 2. small but important: 3. achieved in a…. Learn more.

Something that is subtle is not obvious: a professional food taster might be able to perceive subtle differences of flavor that most people don't notice.

Subtle definition: thin, tenuous, or rarefied, as a fluid or an odor.. See examples of SUBTLE used in a sentence.

2. difficult to detect or analyse, often through being delicate or highly refined: a subtle scent. 5. delicate or faint: a subtle shade. 6. cunning or wily: a subtle rogue. 7. operating or executed in secret: a subtle intrigue.

Something that is subtle is not immediately obvious or noticeable. ...the slow and subtle changes that take place in all living things. Intolerance can take subtler forms too.

Definition of subtle adjective from the Oxford Advanced Learner's Dictionary. (often approving) not very obvious or easy to notice. There are subtle differences between the two versions. The fragrance is a subtle blend of jasmine and sandalwood. She's been dropping subtle hints about what she'd like as a present.

difficult to detect or analyse, often through being delicate or highly refined: a subtle scent showing or making or capable of showing or making fine distinctions of meaning

subtle, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

SUBTLE meaning: 1 : hard to notice or see not obvious; 2 : clever and indirect not showing your real purpose