While the ocean is wide, the trench may be far from continental sources of sediment and so may be deep. As continents approach each other, the trench can fill with continental sediments and become shallower.
Definition of blunt. 3a : abrupt in speech or manner She tends to be blunt. a blunt refusalb : being straight to the point : direct To be perfectly blunt, I don't think he can do it.
uncouth - lacking refinement or cultivation or taste; he had coarse manners but a first-rate mind; behavior that branded him as common; an untutored and uncouth human being; an uncouth soldier--a real tough guy; appealing to the vulgar taste for violence; the vulgar display of the newly rich.