merit-, meri-, mere- +

(Latin: to deserve, deserve; earn, acquire, gain; entitled to)

meritorious, meritory
Deserving praise, reward, esteem, etc.; having merit; praiseworthy.
meritoriously
In a meritorious manner.
premerit
To merit or deserve beforehand.
promerit
1. To oblige; to confer a favor on.
2. To deserve; to procure by merit.
unmerited
1. Not merited or deserved.
2. Undeserved; unworthy.
unmeritorious
Without merit.