Des-pe-rate, diobaith; ffyrnig; peryglus

Des-pot-ic, gormesdeyrnog; creulawn

Des-pot-ism, trawsawdurdod; gormesdeyrnedd

Des-ti-ny, tynged; ffawd, rhaid

Des-ti-tute, amddifad; angenog: amddifadu

De-struc-tion, dystryw, dinystr; colledigaeth

De-struc-tive, dystrywiol, dinystriol; marwol

De-tach-ment, dydoliad; gwahanlu

De-tec-tion, dadguddiad; canfyddiad

De-ter-mine, penderfynu; penu, bwriadu