IPA: /sɛnˈtɛnʃəsli/
KK: /sɛnˈtɛnʃəsli/
In a way that expresses opinions or judgments in a pompous or moralizing manner, often using few words.
He spoke sententiously, making his point sound more important than it really was.
Sententiously → It is formed from "sententia" (meaning opinion or feeling) and the suffix "-ous" (meaning full of). The word "sententiously" means full of opinions or expressing them in a pompous or moralizing manner.
Think of someone who is 'full of opinions' ('sententia') and expresses them in a way that seems overly moralizing or pompous.