To be added.*
As verb, Old English carian, cearian ‘be anxious or solicitous; grieve; feel concern or interest’, from Proto-Germanic *karō- ‘lament; grief, care’, from PIE base *gar- ‘cry out, call, scream’, perhaps in the original sense ‘bewail the deceased’. Not related to Latin curāre ‘take care of’, from cūra ‘concern, worry, anxiety’, root of cure, of uncertain origin.
As noun, Old English caru, cearu ‘sorrow, anxiety, grief’, also ‘burdens of mind; serious mental attention; concern, anxiety caused by apprehension of evil or the weight of many burdens’.