[buh-nal-ahyz, -nah-lahyz, beyn-l-ahyz]
verb (used with object), ba·nal·ized, ba·nal·iz·ing.
  1. to render or make banal; trivialize: Television has often been accused of banalizing even the most serious subjects.
Also especially British, ba·nal·ise.

Origin of banalize

First recorded in 1960–65; banal + -ize Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019