From Middle English swere, sware, from Old English swǣr, swār (“heavy, of great weight, oppressive, grievous, painful, unpleasant, great, sad, feeling or expressing grief, grave, slow, dull, sluggish, slothful, indolent, inactive from weakness, enfeebled, weak”), from Proto-West Germanic *swār, from Proto-Germanic *swēraz, *swērijaz (“heavy”), from Proto-Indo-European *swer- (“heavy”).