Definition of keens:
(adj) :
(chiefly Commonwealth) Often with a prepositional phrase, or with to and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested.
(adj) :
Having a fine edge or point; sharp.
(adj) :
Fierce, intense, vehement.
(adj) :
Acute of mind, having or expressing mental acuteness; penetrating, sharp.
(adj) :
Of cold, wind, etc.: cutting, penetrating, piercing, sharp.
(adj) :
Acrimonious, bitter, piercing.