WordNet sense 1 (make numb or insensitive):

benumb, numb

WordNet sense 2 (not having a point especially a sharp point):

pointless, unpointed

WordNet sense 3 (not having a sharp edge or point):

dull

WordNet sense 4 (characterized by directness in manner or speech; without subtlety or evasion):

candid, forthright, frank, outspoken, plainspoken, point-blank, free-spoken, straight-from-the-shoulder

WordNet sense 5 (extended senses; direct in means or manner or behavior or language or action):

direct

WordNet sense 6 (devoid of any qualifications or disguise or adornment):

crude, stark

WordNet sense 7 (not conditional):

unconditional

WordNet sense 8 (make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation):

deaden