This word, among others, he has preserved; and he makes use of it adverbially in its proper sense, when he describes any body superlatively great, and excellent.
"A New System; or, an Analysis of Antient Mythology. Volume I."
Jacob Bryant
It is also used adverbially, both alone and with the article a; as, "The poor sleep little."
"The Grammar of English Grammars"
Goold Brown
Yet, in instances not a few, the same word is capable of being used both adjectively and adverbially.
"The Grammar of English Grammars"
Goold Brown