due, n. [debt]; [duty], [right].
duel, n. monomachia, monomachy.
duelist, n. monomachist.
dugout, n. excavation.
dull, a. unintelligent, obtuse, [stolid], loggerheaded, [inapt], doltish, beetle-headed, blockish, [sluggish]; [apathetic], [unfeeling], insensate, [callous]; [blunt], obtuse, dulled, pointless; [dim], [faint]; [tedious], uninteresting, prosaic, [stupid], wearisome, jejune, depressing; [lifeless], [torpid], [slow], [inactive]; matte, [lusterless], lackluster.
dull, v. [blunt], [rebate], [benumb], obtund, [stupefy], [deaden], hebetate; sully, [tarnish], [obscure], [dim], [bedim]; depress, [sadden], dishearten; assuage, [alleviate], [moderate], [allay].
dumb, a. [mute], [speechless]; pantomimic.
dumbness, n. muteness, obmutescence, [speechlessness].
dumb show. pantomime.
dumfound, v. astound, [amaze], [astonish], [confound].