So delicate or precise as to be difficult to analyze or describe. adjective
The subtle nuances of the artist's brushwork were lost on the casual observer.
There was a subtle difference in tone between the two speeches.
Making use of clever and indirect methods to achieve something. adjective
She used a subtle approach to persuade her parents to let her go on the trip.
His subtle manipulation of the conversation steered it in his favor.
Crafty or cunning. adjective
The spy's subtle tactics allowed him to gather information without being detected.
Her subtle wit often went unnoticed by those who weren't paying attention.
Characterized by mental acuteness or penetration. adjective
His subtle mind quickly grasped the complexities of the situation.
The philosopher's subtle arguments challenged the audience's preconceptions.