Answer: subtlest

AnswerCrossword Clue
SUBTLESTLeast obvious
subtlestCapable of making fine distinctions
subtlestArranged in an ingenious and elaborate way
subtlest(of a mixture or effect) Delicately complex and understated
subtlestSUBTLE, insidious, also SUBTILE
subtlest(esp. of a change or distinction) So delicate or precise as to be difficult to analyze or describe
subtlestMaking use of clever and indirect methods to achieve something
subtlestCrafty; cunning