do

docile (adj.) easily taught or trained (She successfully taught the docile puppy several tricks.)

dogmatic (adj.) aggressively and arrogantly certain about unproved principles (His dogmatic claim that men were better than women at fixing appliances angered everyone.)

dormant (adj.) sleeping, temporarily inactive (Though she pretended everything was fine, her anger lay dormant throughout the dinner party and exploded in screams of rage after everyone had left.)

dour (adj.)stern, joyless (The children feared their dour neighbor because the old man would take their toys if he believed they were being too loud.)