Subtle isn't Synonyms

Subtle replaced

intelligent isn't

sensitive isn't

Definitions for Subtle

(adjective) clever at attaining one's ends by indirect and often deceptive means
(adjective) made or done with extreme care and accuracy
(adjective) satisfying or pleasing because of fineness or mildness

SI abbreviation

SI is an abbreviation for Subtle Isn't

What does SI stand for?

SI stands for "Subtle Isn't"