The antonyms for the word "sub-tiler" are "obvious," "blatant," "apparent," and "overt." These antonyms describe qualities that are quite different from subtlety, which refers to a quality of being delicate or nuanced. When something is obvious or apparent, it is clear and unmistakable, lacking the careful finesse that is implied by subtlety. Blatant and overt are even more severe in their lack of subtlety, referring to things that are not only obvious but perhaps even crude or unsubtle in their execution. By knowing these antonyms, readers can better appreciate the fine art of subtlety when it is employed in writing, art, or other forms of expression.