The child sat by himself, looking 'pensive'.
She stared 'pensively' out the window.
a 'pensive' mood/expression/sigh
(..) What-what is that? Do you... can you tell me? Can you tell me? Does the monkey know? You're so pensive, what are you thinking about? Oh, just how much it sucks that we have to get old. Oh Claire, please, don't get maudlin on me. (..)2005 TvShow: Six Feet Under Title: Everyone's Waiting Season: 5 Episode 12