- dilapidated: Fallen into decay or partial ruin.
- dilate: To enlarge in all directions.
- dilatory: Tending to cause delay.
- dilemma: A situation in which a choice between opposing modes of conduct is necessary.
- dilettante: A superficial amateur.
- diligence: Careful and persevering effort to accomplish what is undertaken.
- dilute: To make more fluid or less concentrated by admixture with something.
- diminution: Reduction.
- dimly: Obscurely.
- diphthong: The sound produced by combining two vowels in to a single syllable or running together the sounds.
- diplomacy: Tact, shrewdness, or skill in conducting any kind of negotiations or in social matters.
- diplomat: A representative of one sovereign state at the capital or court of another.
- diplomatic: Characterized by special tact in negotiations.
- diplomatist: One remarkable for tact and shrewd management.
- disagree: To be opposite in opinion.
- disallow: To withhold permission or sanction.
- disappear: To cease to exist, either actually or for the time being.
- disappoint: To fail to fulfill the expectation, hope, wish, or desire of.
- disapprove: To regard with blame.
- disarm: To deprive of weapons.
- disarrange: To throw out of order.
- disavow: To disclaim responsibility for.
- disavowal: Denial.
- disbeliever: One who refuses to believe.
- disburden: To disencumber.
- disburse: To pay out or expend, as money from a fund.
- discard: To reject.
- discernible: Perceivable.
- disciple: One who believes the teaching of another, or who adopts and follows some doctrine.
- disciplinary: Having the nature of systematic training or subjection to authority.
- discipline: To train to obedience.
- disclaim: To disavow any claim to, connection with, or responsibility to.
- discolor: To stain.
- discomfit: To put to confusion.
- discomfort: The state of being positively uncomfortable.
- disconnect: To undo or dissolve the connection or association of.
- disconsolate: Grief-stricken.
- discontinuance: Interruption or intermission.
- discord: Absence of harmoniousness.
- discountenance: To look upon with disfavor.
- discover: To get first sight or knowledge of, as something previously unknown or unperceived.
- discredit: To injure the reputation of.
- discreet: Judicious.
- discrepant: Opposite.
- discriminate: To draw a distinction.
- discursive: Passing from one subject to another.
- discussion: Debate.
- disenfranchise: To deprive of any right privilege or power
- disengage: To become detached.
- disfavor: Disregard.