platitudinarian
/ˌplætɪˌtudɪˈnɛriən/
noun
- A person who habitually uses platitudes or speaks in dull, trite phrases.
- The speaker was a platitudinarian who never said anything new.
- Don't be a platitudinarian; try to say something meaningful.
- The meeting was dominated by a platitudinarian who bored everyone.