Mid 18th century; earliest use found in Horace Walpole (1717–1797), author, politician, and patron of the arts. From old + fashion + -ably, after fashionably.
Definition of old-fashionably in US English:
old-fashionably
adverb
rare
In an old-fashioned manner.
Origin
Mid 18th century; earliest use found in Horace Walpole (1717–1797), author, politician, and patron of the arts. From old + fashion + -ably, after fashionably.