A seven-letter word meaning serious and eager could be "earnest".
counsel
A seven letter word for lasts is endures.
Debacle
The seven letters, mcuanst, can be formed into the seven letter word, sanctum. Sanctum is an English word meaning 'a sacred place.'
earnest
A seven-letter word meaning serious and eager could be "earnest".
You are serious.
Gravest.
tragedy
The second letter of the seven letter word meaning "one-fourth" is "u." The word is "quarter."u as in quarter
A seven-letter word meaning 'including everything' is 'overall'.
A seven-letter synonym for 'egg shaped' is obovoid or obovate.
Examples of seven letter synonyms for the verb to reveal are:confessdeclaredivulgeexplainpublishpresentprofessuncover
uncover
surreal
missing