IMMENSURABLE
immeasurable, unmeasurable, immensurable
(adjective) impossible to measure; “unmeasurable reaches of outer space”; “immeasurable suffering”
Source: WordNet® 3.1
Etymology
Adjective
immensurable (comparative more immensurable, superlative most immensurable)
unmeasurable, immeasurable; not able to be measured, therefore connoting extremely large
Source: Wiktionary
Im*men"su*ra*ble, a. Etym: [Pref. im- not + L. mensurabilis
measurable: cf. F. immensurable. Cf. Immeasurable.]
Definition: Immeasurable.
What an immensurable space is the firmament. Derham.
Source: Webster’s Unabridged Dictionary 1913 Edition