Source : Webster's Revised Unabridged Dictionary (1913)

Unexceptionable \Un`ex*cep"tion*a*ble\, a.
   Not liable to any exception or objection; unobjectionable;
   faultless; good; excellent; as, a man of most unexceptionable
   character. -- {Un`ex*cep"tion*a*ble*ness}, n. --
   {Un`ex*cep"tion*a*bly}, adv.

Source : WordNet®

unexceptionable
     adj : completely acceptable; not open to exception or reproach;
           "two unexceptionable witnesses"; "a judge's ethics
           should be unexceptionable" [syn: {unimpeachable}]