subtle - Dictionary definition and meaning for word subtle
sub+tle(title) without subtitle it is difficult to understand the other languages
subtle:substitute,if a main player is down,then coach will substitute him and the the substitute is not known n difficult to detect....
SUB(down)+TELL- so down that it is difficult to tell/percieve
see SUB+ btle sounds like BATTLE a subject which acts like battle is very difficult to decipher or understand