Wielki słownik angielsko-polski red. nacz D. Jemielniak, M. Miłkowski
                        (Noun) zaduma;
(Adjective) marzący, marzycielski;
Nowoczesny słownik angielsko-polski 
                        zaduma
Wordnet angielsko-polski 
                        (a calm, lengthy, intent consideration) 
kontemplacja 
synonim: contemplation
synonim: reflection
synonim: reflexion
synonim: rumination
synonim: thoughtfulness
(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") 
refleksyjny 
synonim: brooding
synonim: broody
synonim: contemplative
synonim: meditative
synonim: pensive
synonim: pondering
synonim: reflective
synonim: ruminative