overmaster

to subject to incapacitating emotional or mental stress the student was overmastered by the stress of taking the college placement test and broke down crying Synonyms crush, devastate, floor, grind (down), oppress, overcome, overwhelm, overpower, prostrate, snow under, swamp, whelmRelated Words deluge, drown, sink; confute, defeat, refute; break, demoralize, distress, disturb, rock, shatter, stagger, throw, unman, unnerve, upset