Part of speech: Adverb
to a faint degree or weakly perceived
Example: between him and the dim light a form was outlined faintly; stars shining faintly through the overcast; could hear his distant shouts only faintly; the rumors weren't even faintly true
The word "faintly" comes from Middle English feintli.
faint – A related word in the same word family.
ly – A related word in the same word family.
Middle English had more flexible word order than Modern English because it retained more inflections.