UNEXCEPTIONABLE
unexceptionable, unimpeachable
(adjective) completely acceptable; not open to exception or reproach; “two unexceptionable witnesses”; “a judge’s ethics should be unexceptionable”
Source: WordNet® 3.1
Etymology
Adjective
unexceptionable (comparative more unexceptionable, superlative most unexceptionable)
Beyond reproach; unimpeachable
Source: Wiktionary
Un`ex*cep"tion*a*ble, a.
Definition: 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.
Chesterfield is an unexceptionable witness. Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition