Common Adjectives:
* Doux (m) / Douce (f) - sweet, gentle, soft
* Difficile - difficult
* Dangereux (m) / Dangereuse (f) - dangerous
* Délicieux (m) / Délicieuse (f) - delicious
* Dernier (m) / Dernière (f) - last
* Déçu (m) / Déçue (f) - disappointed
* Déterminé (m) / Déterminée (f) - determined
* Droite (f) - right (direction)
Less Common Adjectives:
* Dénué (m) / Dénuée (f) - deprived of, lacking
* Déchirant (m) / Déchirante (f) - heartbreaking, moving
* Dépouillé (m) / Dépouillée (f) - simple, uncluttered
* Dépit (m) / Dépit (f) - spiteful, vexing
* Divers (m) / Diverse (f) - diverse, varied
* Dominant (m) / Dominante (f) - dominant
* Doré (m) / Dorée (f) - golden
Note: This is not an exhaustive list. There are many other French adjectives beginning with "D," and some are more common than others depending on the context.