Adverb
in a pithy sententious manner
Source: WordNetTo a great mind, nothing is little,' remarked Holmes, sententiously. Arthur Conan Doyle
The poets make Fame a monster. They describe her in part finely and elegantly, and in part gravely and sententiously. They say, look how many feathers she hath, so many eyes she hath underneath; so many tongues; so many voices; she pricks up so many ears. Francis Bacon
"Better to make haste slowly than not at all,” said Amnir sententiously. Leigh Brackett
she expressed herself pithily Source: Internet