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.
dull - blunted in responsiveness or sensibility; a dull gaze; so exhausted she was dull to what went on about her- Willa Cather. insensitive - deficient in human sensibility; not mentally or morally sensitive; insensitive to the needs of the patients.