From Middle English inklen, inclen (“to give an inkling of, hint at, mention, utter in an undertone”), derived from inke (“apprehension, misgiving”), from Old English inca (“doubt, suspicion”), from Proto-West Germanic *inkō, from Proto-Germanic *inkô (“ache, regret”), from Proto-Indo-European *h₁eng- (“illness”). Cognate with Old Frisian jinc (“angered”), Old Norse ekki (“pain, grief”), Norwegian ekkje (“lack, pity”).