ashamedHe was ashamed that he had been caught stealing.
abashedShe looked at the floor, abashed.
shamefacedHe stood shamefaced at the door, looking at the vase he had just knocked to the ground.
sheepishShe startled, then gave him a sheepish smile as she picked up her dropped papers.
mortifiedShe'd be mortified if she knew she'd upset her family.
guiltyI feel so guilty about forgetting her birthday.
humiliatedFeeling betrayed and humiliated, she considered quitting her job.