
Subtle
    
    WordNet
        adjective
(1)   Faint and difficult to analyze
"Subtle aromas"
(2)   Working or spreading in a hidden and usually injurious way
"Glaucoma is an insidious disease"
"A subtle poison"
(3)   Be difficult to detect or grasp by the mind
"His whole attitude had undergone a subtle change"
"A subtle difference"
"That elusive thing the soul"
(4)   Able to make fine distinctions
        "A subtle mind"
WiktionaryText
        Etymology
, , , later , , ; probably, originally, “woven fine”, and from + , from .
Adjective
-  Hard to grasp; not obvious or easily understood; barely noticeable.
- The difference is subtle, but you can hear it if you listen carefully.
 
- Cleverly contrived.
- Cunning, skillful.
-  insidious
-  1623, William Shakespeare, The Tragedy of Richard the Third, act iv, scene 4,
- Thy age confirmed, proud, subtle, bloody, treacherous.
 
 
-  1623, William Shakespeare, The Tragedy of Richard the Third, act iv, scene 4,
- Tenuous; rarefied; of low density or thin consistency.


