pensive

surumielinen

mietteliäs Having the appearance of deep, often melancholic, thinking.
Looking thoughtful, especially from sadness.
1748. David Hume. Enquiries concerning the human understanding and concerning the principles of moral. London: Oxford University Press, 1973. § 4.

Abstruse thought and profound researches I prohibit, and will severely punish, by the pensive melancholy which they introduce