sweer（adj.）
"inactive, indolent; loath, reluctant, unwilling," Middle English swere, also "grievous, sad," from Old English swær "heavy; sad; oppressive; grievous; sluggish, inactive, weak;" cognate with Old Frisian swer, Old Saxon swar, Middle Dutch swaer, Dutch zwaar, Old High German suari, "heavy," German schwer "difficult," Gothic swers "honored, esteemed," literally "weighty."
This is probably from a PIE root *sehro- "slow, heavy" (source also of Lithuanian sveriu, sverti "to weigh, lift," svarus "heavy, weighty").
The physical senses did not survive Old English and the word died out after Middle English.