The Oxford Thesaurus An A-Z Dictionary of Synonyms - bluffэadj.

1) blustering, gruff, rough, abrupt, blunt, curt, short, crude: Fred's bluff manner puts many people off. 2) frank, open, hearty, straightforward, plain, plain-spoken, outspoken, affable, approachable, good-natured, friendly: That comment is typical of his bluff honesty. --n. 3) cliff, escarpment, precipice, scarp, headland, promontory, palisades: As you sail down the lower Hudson river, the tall bluffs form a natural wall along the western bank.