DIFFER—vary, diverge, disagree, bicker, nag, split. (Accord, harmonize.)
DIFFERENT—various, diverse, unlike. (Identical.)
DIFFICULT—hard, tough, laborious, arduous, formidable. (Easy, facile, manageable, pliant.)
DIFFUSE—discursive, digressive, diluted. (Condensed, concise, terse.)
DIGNIFY—elevate, exalt, ennoble, honor, advance, promote. (Degrade, disgrace, demean, vulgarize.)
DILATE—widen, extend, enlarge, expand, descant, expatiate. (Contract, narrow, compress, reduce.)
DILATORY—slow, tardy, slow-paced, procrastinating, lagging, dawdling. (Prompt, peremptory, quick, instant.)
DILIGENCE—zeal, ardor, assiduity. (Indolence.)
DIMINISH—lessen, reduce, curtail, retrench, bate, abate, shorten, contract. (Increase, augment, aggrandize, enlarge.)
DISABILITY—incapacity, unfitness. (Power.)