alert.
avid, agog
eager
That could be zeal or zest.
Zeal
A seven-letter word meaning serious and eager could be "earnest".
A four letter word meaning not kosher is: tref
Eager
keen
Agog
anxious, enthusiastic, interested, alert, and eager
eager
enthusiastic, passionate, eager, spirited, keen, fired, devoted, dedicated
An abstract noun for the word "keen" is "keenness." This term encapsulates the quality or state of being eager, enthusiastic, or sharp in perception. It reflects the intensity of interest or desire associated with being keen.
keen
· kitchen - place to cook the turkey · knife to cut the turkey
OK THEN THAT IS REALLY SINCERITY
Restlessly eager might be antsy.
It is keen