Answer: Option D
Solution(By Examveda Team)Imperceptible-so slight ,gradual,or subtle as not to be perceived
Mean-signify, intend to convey or refer
Obvious-easily perceived or understood
Humble-having r showing a modest or low estimate of one's importance
Subtle-so delicate or precise as to b difficult to analyse or describe
So, synonym of Imperceptible is Subtle.
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