difference between blunt and brusque
Solution 1:
He spoke brusquely/bluntly.
Brusquely describes how you deliver your comment (abruptly, tersely, briskly, peremptorily, offhandedly, rudely ...(OED))
antonym - politely, verbosely (Google)
Bluntly describes the character of your comment (without ceremony or delicacy; abrupt, curt, to the point, frank, candid, direct, bluff, undiplomatic, indelicate, ...(OED))
antonym - subtly, tactfully (Google)