1) French word used in English 2) Incalculable 3) Indeterminate 4) Not determinable 5) Unascertainable 6) Undeterminable 7) Undetermined 8) Undiscoverable 9) Unpredictable Found on https://www.crosswordclues.com/clue/indeterminable
• (n.) An indeterminable thing or quantity. • (a.) Not determinable; impossible to be determined; not to be definitely known, ascertained, defined, or limited. Found on http://thinkexist.com/dictionary/meaning/indeterminable/
In`de·ter'mi·na·ble adjective [ Latin indeterminabilis : confer French indéterminable . See In- not, and Determine.] Not determinable; impossible to be determined; not to be definitely known, ascertained, defined, or limited. -- In`de*ter'mi*na*bly , Found on http://www.encyclo.co.uk/webster/I/42