Synonyms for Constipation (same or very similar meaning)
WordNet sense 1 (irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis):
irregularityWordNet sense 2 (the act of making something futile and useless (as by routine)):
impairment, stultification, deadeningFrom the ODE community, based on WordNetadd/edit