The opposite of subtle could be obvious.
Depending on the context, it could also be overt, harsh, forthright, or coarse.
It COULD be keeping quiet, silent, not speaking. :D
The opposite could be indistinct, unclear, fuzzy, blurry, or obscured.
a choice of words as usual, could be lamentable, wretched, dreadfull or diabolical
The comedian's jokes weren't vulgar; they relied upon sharpness and wit.
Yes, subtle is a word meaning elusive.
The opposite of subtle is obvious.
obvious
Subtle or understated.
meek mild understated subtle
It COULD be keeping quiet, silent, not speaking. :D
The opposite could be indistinct, unclear, fuzzy, blurry, or obscured.
a choice of words as usual, could be lamentable, wretched, dreadfull or diabolical
subtle means the opposite of obvious
The comedian's jokes weren't vulgar; they relied upon sharpness and wit.
Subtle can go both ways: either subtle/subtler/subtlest, or subtle/more subtle/most subtle. Both are correct.
subtle
Some spices have a subtle aroma. The wink she gave was no subtle clue.