"with knowledge of truth," late 14c., present-participle adjective from know (v.). From c. 1500 as "shrewd, sharp, smart." Related: Knowingly.
a knowing act of fraud
a knowing collector of rare books
knowing instructors
knotweed
knotwork
know
knowable
know-how
knowing
know-it-all
knowledge
knowledgeable
known
know-nothing