A. Mean
B. Obvious
C. Humble
D. Subtle
✅ The correct answer is option D.
Imperceptible-so slight ,gradual,or subtle as not to be perceived
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.