The depth of the ocean trench is indeterminable.Due to sparse records, the timeline remains indeterminable.The cause of the strange noise was indeterminable.
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Indeterminate
/ˌɪndɪˈtɜːmənət/
Not able to be determined or unclear
Examples:
The outcome remains indeterminate after the vote.Her indeterminate response left us puzzled.His intentions were somewhat indeterminate.
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Ways to tell them apart:
Remember that indeterminable often implies something which is impossible to determine or measure, while indeterminate means something not precisely fixed.
Indeterminable can imply an absolute impossibility in determining, indeterminate indicates a lack of clarity or determination but could possibly be resolved.
Think of indeterminable as a dead-end in finding a determination, and indeterminate as more of an ongoing uncertainty.