Bluntest

adjective

1. Having a thick edge or point; not sharp.
2. Dull in understanding; slow of discernment; opposed to acute.
3. Abrupt in address; plain; unceremonious; wanting the forms of civility; rough in manners or speech.

   "the blunt admission that he had never liked my company"

4. Hard to impress or penetrate.
5. Slow or deficient in feeling: insensitive.