EXCUSABLY
excusably, forgivably, pardonably
(adverb) in an excusable manner or to an excusable degree; “he was excusably late”
Source: WordNet® 3.1
Etymology
Adverb
excusably (comparative more excusably, superlative most excusably)
In an excusable manner or to an excusable degree
Source: Wiktionary
EXCUSABLE
Ex*cus"a*ble a. Etym: [L. excusabilis: cf. F. excusable. See Excuse.]
Definition: That may be excused, forgiven, justified, or acquitted of
blame; pardonable; as, the man is excusable; an excusable action.
– Ex*cus"a*ble*ness, n.
– Ex*cus"a*bly, adv.
The excusableness of my dissatisfaction. Boyle.
Source: Webster’s Unabridged Dictionary 1913 Edition