INDETERMINABLY
indeterminably
(adverb) in an indeterminable manner; “their relationship was of an indeterminably vague nature”
Source: WordNet® 3.1
Etymology
Adverb
indeterminably (comparative more indeterminably, superlative most indeterminably)
in an indeterminable manner
Source: Wiktionary
INDETERMINABLE
In`de*ter"mi*na*ble, a. Etym: [L. indeterminabilis: cf. F.
indéterminable. See In- not, and Determine.]
Definition: Not determinable; impossible to be determined; not to be
definitely known, ascertained, defined, or limited.
– In`de*ter"mi*na*bly, adv.
In`de*ter"mi*na*ble, n.
Definition: An indeterminable thing or quantity. Sir T. Browne.
Source: Webster’s Unabridged Dictionary 1913 Edition