Depending on which meaning of "good", some 10 letter words could be: acceptable, stupendous, inculpable, proficient, satisfying, charitable
Something that is good for you is beneficial.
beneficial
useful, proper, bright
convenient
Beneficial.
Additional.
Earwigging.
d for deactivate
commission
commission
Swingshift
commission
pedestrian
P
Commission
murphyslaw :)
Commission