say it: MAD-uh-ning
maddening is an adjective meaning "extremely annoying or displeasing". It carries one recorded sense.
extremely annoying or displeasing
“his cavelier curtness of manner was exasperating”
“I've had an exasperating day”
“her infuriating indifference”
“the ceaseless tumult of the jukebox was maddening”
Definitions, synonyms and semantic relations for maddening come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.