saturnine

Concise Oxford English Dictionary © 2008 Oxford University Press:
saturnine /ˈsatənʌɪn/

▶adjective

• 1 gloomy.

  ■ (of a person's looks) dark and brooding.

• 2 archaic relating to lead.

– derivatives
saturninely adverb.

– origin ME: from OFr. saturnin, from med. L. Saturninus ‘of Saturn’ (identified with lead by alchemists and assoc. with slowness and gloom by astrologers).