Eager
The abstract noun form for the adjective keen is keenness.
There is only one (1) syllable in the word keen.
Roy was very keen for apples today.
A knife is a keen tool that is dangerous for kids to play with.
blunt, pointless
Yes it is
Dull.
keen
The word 'keen' is a noun, a word for a dirge or a lament for the dead. Another noun form is 'keener', one who wails for the deadThe noun form for the adjective keen is keenness.
That could be zeal or zest.
"Keen" is and adjective, used to describe something as sharp or acute. "The sword had a keen edge." "He was a man of keen intellect." It can also be used to express enthusiasm. "He was keen to learn another language."
keen sight