numbing adjective 1noun 1forms 2phrases 1 adjective1 •That numbs. noun1 •An act by which something is numbed.The numbing of hibakusha reflected a shattering of the psychic forms of the self. — 2011 formsmore numbing · most numbing Phrases with numbing mind-numbingExcessively boring, tedious, or dull; repetitive; of an activity, etc., lacking any interest or variety that might serve as intellectual stimulation.