keen
KEENadjMeaning eager and enthusiastic; also, sharp
Memory hook a KEEN TEEN. Dev, the keen teen, is first in line at the climbing rock, helmet on, an hour before it opens. He is keen to climb.
Dev was keen to try the new climbing wall.
In context The owl’s keen eyesight let it spot a mouse moving in the grass from the top of a tall pine, far across the dark field.
Similar eager, enthusiastic, avid, sharp
Opposite reluctant, unwilling, dull
From Old English cene, “bold, brave.”