'caustic'(Modern English angry)
Formed on anger + English adjectival suffix.
Proposed ON Etymon (OIcel representative)
angr (n.) ‘sorrow, resentment, distress; repentance; tribulation, injury’
(ONP angr (1) (sb.))
Other Scandinavian Reflexes
Far angur, Icel angur, Norw anger, Dan anger, Sw ånger
cp. ange 'anxious, painful, distressing', enge 'narrow, anguished, oppressive'
Phonological and morphological markers
Widespread from the late 14c., incl. Chaucer and Gower.
Occurrences in the Gersum Corpus
GollCl alone interprets the instance at Cl 1035 as a 'scribal error' for <aigre> from OFr (1035n), but this is unlikely (see McGee 384).