Yearning, vehement, desirous, appetent, covetous, desiring.
ravenous
eager
A seven-letter word meaning serious and eager could be "earnest".
Restlessly eager might be antsy.
Contribute
Zeal
eager
It's ANXIOUS
eager, ester, error
eager, ester, error
Eight letter word is "response"
Landlord is an eight letter word for innkeeper.
Agog