1. sluggish in temperament; gloomy; taciturn.
2. suffering from lead poisoning, as a person.
3. due to absorption of lead, as bodily disorders.
1. Having the temperament of one born under the supposed astrological influence of Saturn.
2. Melancholy or sullen.
When Diana saw her nine-year-old son walk through the door, she asked him why he had such a depressed, saturnine expression on his face. He then handed her a school test marked '67%' and burst into tears.
Classical mythology class really does teach you something...
Also, I'm sorry my sentences have only been about poor, failing children... it's all rather saturnine.