WordReference Random House Unabridged Dictionary of American English © 2026
plat•i•tu•di•nal
(plat′i to̅o̅d′n əl, -tyo̅o̅d′-),USA pronunciation adj.
- platitudinous.
- platitude + -inal (see -al1), on the model of Latin derivatives of abstract nouns in -tūdō, stem -tūdin- (compare latitudinal) 1865–70
'platitudinal' also found in these entries (note: many are not synonyms or translations):