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.
No, they're more or less the same thing (in terms of subtle shades of meaning, "entreat" is somewhere between "ask" and "beg"... "ask really, really nicely," maybe).
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.
The opposite of "small taste" would be "strong flavor" or "intense taste." This suggests a bold, rich, or pronounced flavor profile that is easily detectable and impactful, contrasting with a subtle or mild taste.
Subtle can go both ways: either subtle/subtler/subtlest, or subtle/more subtle/most subtle. Both are correct.
subtle