Definition of 然う
(adv) in that way (concerning the actions of the listener or concerning the ideas expressed or understood by the listener; with a neg. sentence, implies that something isn't as much as one might think); thus; such
Now that I am a grownup, I think otherwise.
(int) so (used to express agreement with something said)
"Does your back hurt?" "No, not really." "Oh, that's something then, isn't it?"
- so? (used to express some doubt with something said)