All 5 Uses

subtle
in
The Chocolate War
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One of those exams where the wrong, subtle interpretation of the facts made the difference between pass and fail.
Chpt 16 *

subtle = difficult to understand (requiring finely tuned sensitivity and relevant knowledge)
He moved with a subtle rhythm, languidly, the walk of an athlete although he hated all sports and had nothing but contempt for athletes.†
Chpt 2
Usually, Archie didn't pick athletes for assignments—he claimed they were too stupid to absorb the delicate shadings, the subtle intricacies involved.†
Chpt 2
Archie and all his subtle crap.†
Chpt 25
He was also aware of a change in the class, a subtle alteration of mood and atmosphere.†
Chpt 30

Definitions:

(1) (subtle as in: a subtle poison)
working in an indirect or hidden way
(2) (subtle as in: a subtle shade of blue)
understated so as not to draw excess attention
(3) (subtle as in: a subtle difference or thinker)
not obvious, but noticeable with enough insight and knowledge

or:

able to notice or understand things that require insight and sensitivity
(4) (meaning too rare to warrant focus)