adjective
Etymology: from present participle of madden
1. : tending to craze
maddening pain … can rarely be alleviated but by opium — J.M.Good
2.
a. : tending to infuriate
was facing a horrible death … a maddening waste of life — Upton Sinclair
b. : tending to vex : irritating
the ceaseless tinny tumult of the jukebox was maddening — John McNulty
• mad·den·ing·ly adverb
• mad·den·ing·ness noun -es