n.
'wickedness, folly'
(Modern English unthrift)Formed with native prefix un- on a n. always derived from ON: either from the borrowed v. within English (so OED), see þryue (v.), or (as most commentators have it, incl. Bj.) directly from an ON n. derived from the zero-grade, cp. þrift (fem.) 'thrift' (also cp. þrif (neut.) 'thriving condition, prosperity').
PGmc Ancestor
*þrīfan- or *þrift-
Proposed ON Etymon (OIcel representative)
þrift (n.)(fem.) 'thrift', cp. þrif (n.)(neut.) 'thriving condition, prosperity'
(ONP þrift (sb.))
Other Scandinavian Reflexes
Icel þrift, Norw trîvst; cp. Icel þrif, Norw triv
OE Cognate
Phonological and morphological markers
Summary category
B1
Thrift is common and widespread, with and without prefix un-, from the early 14c.; þryue (v.) is attested from Orrm onwards.
Occurrences in the Gersum Corpus
Cl 516, 1728