Graver

2 clues
Less blithe
More serious
Similar answers:
Aaverage
Aaverages
Abeverage
Abjectpovert
Aboverage
Abovereferenced
Abovereproach
Abovetheaverage
Abridgedversion
Absolutegravity
Academicgrades
Academicprogram
Acesonnetverses
Acesover
Acesovereights
Achickenineverytot
Achiever
Achievers
Acouvert
Acowoncegrazed