saturnine

UK: /ˈsætə^rnaɪn/ US: /ˈsætɚˌnaɪn/ ,(sat′ər nīn′)

WordReference Random House Learner's Dictionary of American English © 2025

sat•ur•nine /ˈsætɚˌnaɪn/   adj. 

1. sluggish or gloomy in the way one feels or appears;
   glum;
   somber.

WordReference Random House Unabridged Dictionary of American English © 2025

sat•ur•nine  (sat′ər nīn′), adj. 

1. sluggish in temperament; gloomy;
   taciturn.
2. Pathology suffering from lead poisoning, as a person.
3. Pathology due to absorption of lead, as bodily disorders.

• Medieval Latin sāturnīnus (see Saturn, -ine¹)
• late Middle English 1400–50

sat′ur•nine′ly, adv. 
sat′ur•nine′ness, sat•ur•nin•i•ty  (sat′ər nin′i tē), n. 

Collins Concise English Dictionary © HarperCollins Publishers::

saturnine / ˈsætəˌnaɪn/ adjective

1. having a gloomy temperament; taciturn
2. of or relating to lead
3. having or symptomatic of lead poisoning

Etymology: 15th Century: from French saturnin, from Medieval Latin sāturnīnus (unattested), from Latin Sāturnus Saturn, with reference to the gloomy influence attributed to the planet Saturn

ˈsaturˌninely adverb