The Swedish term "tungsint, tystlåten, dyster" matches the English term "saturnine"

other swedish words that include "tungsint" : english :
vemod, svårmod, melankoli, dysterhet, tungsint melancholy
other swedish words that include "tystlåten" : english :
tyst, tystlåten silent
fåordig, tystlåten, tystlåten taciturn