Synonyms for Hangdog (same or very similar meaning)
WordNet sense 1 (showing a sense of guilt):
guilty, shamefaced, shamedWordNet sense 2 (feeling shame or guilt or embarrassment or remorse):
ashamedWordNet sense 3 (frightened into submission or compliance):
browbeaten, intimidated, cowed, bulliedWordNet sense 4 (filled with fear or apprehension):
afraidFrom the ODE community, based on WordNetadd/edit