Pertaining to or resembling lead; grey, heavy, sluggish.
Where but to think is to be full of sorrow / And leaden-eyed despairs, / Where Beauty cannot keep her lustrous eyes, / Or new Love pine at them beyond to-morrow.
From Middle English leden, leaden, from Old English lēaden (“leaden, of lead”). Cognate with West Frisian leaden (“leaden”), Dutch loden (“leaden”). By surface analysis, lead + -en.