deeply or seriously thoughtful;
"Byron lives on not only in his poetry, but also in his creation of the 'Byronic hero' - the persona of a brooding melancholy young man"
- The secretary lay awake all night pondering whether to leave or stay.
- He spent the day pondering the steps to be taken.
- They are pondering moving their offices outside London.
- ponder over 深思，沉思；考虑...