1bluff pronunciation: function: adjective etymology: obsolete dutch blaf flat; akin to middle low german blaff smoothdate: 1627 1 a : having a broad flattened front b : rising steeply with a broad flat or rounded front2 : good-naturedly frank and outspoken— bluff;ly adverb — bluff;ness noun synonyms bluff, blunt, brusque, curt, crusty, gruff mean abrupt and unceremonious in speech and manner. bluff connotes good-natured outspokenness and unconventionality lt;a bluff mannergt;. blunt suggests directness of expression in disregard of others' feelings lt;a blunt appraisalgt;. brusque applies to a sharpness or ungraciousness lt;a brusque responsegt;. curt implies disconcerting shortness or rude conciseness lt;a curt commandgt;. crusty suggests a harsh or surly manner sometimes concealing an inner kindliness lt;a crusty exteriorgt;. gruff suggests a hoarse or husky speech which may imply bad temper but more often implies embarrassment or shyness lt;puts on a gruff posegt;.