platitudinize
To utter one or more platitudes; to make obvious, trivial, or clichéd remarks concerning a topic.
intransitive
He does not attempt lofty flights of eloquence or try to disguise thought under ponderous platitudinising sentences.
To express as or reduce to one or more clichés or truisms.
transitive
Mendelssohn had misunderstood, platitudinized, and misinterpreted the holy concept of revelation.
Where it comes from
From platitude + -ize on analogy of other adjectives ending in -tudinize, from Latin -tūdin- + -ize, the oblique stem of -tūdō. Compare platitudinous.
Adapted from the Wiktionary entry platitudinize (CC BY-SA 4.0).