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 thinking—such as philosophers—and things, such as analysis or reasoning, that demonstrated such thinking.
SUBTLE definition: thin, tenuous, or rarefied, as a fluid or an odor. See examples of subtle used in a sentence.
SUBTLE definition: 1. not loud, bright, noticeable, or obvious in any way: 2. small but important: 3. achieved in a…. Learn more.
- 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.
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. Want to learn more?
Subtle (adjective): Having fine or precise distinctions, often in thought or argument. Something described as "subtle" is often so delicate or precise that it is difficult to analyze or describe, such as a "subtle" difference in color.
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
Adjective subtle (comparative subtler or more subtle, superlative subtlest or most subtle) Senses relating to tangible things. Of an action or movement: very delicate or slight, and thus barely noticeable; not obvious; inconspicuous, unintrusive.