Proto-Germanic: *agl=
Meaning: troublesome, hateful, usw.
Gothic: agl-s `aiskhrós, schimpflich', aglō `Drangsal', us-agljan `bedrängen, plagen', aglus, adv. agluba `dǘskolos, düskólōs, schwierig'
Old English: egle `troublesome, hateful, loathsome, horrid', eglian (eglan, elan), prt. -ode, -ade, ptc. -od, -ad `to trouble, pain, grieve' `Schmerz zufügen'
English: ail `schmerzlich empfunden werden'
Middle Low German: egelen (Gram.) `verursachen'