indeterminable

/ˌˈɪndəˌtʌrmənəbəl/

The adjective indeterminable describes something that can't be known for sure, like what grade you would’ve gotten on a paper you never turned in.

To determine is to calculate something, make a final decision, or to be sure. Something that's indeterminable is none of these — it’s not able to be determined. Maybe you need more information or better math skills. The grade you would’ve gotten on a paper you didn’t write is indeterminable, but if you’re lucky your teacher will give you an extension. Then that shining “C” is all yours!

Definitions of indeterminable

1. adjective

   impossible to settle or decide with finality
   synonyms: undeterminable

   incalculable

   not capable of being computed or enumerated

   indeterminate

   not capable of being determined

   unascertainable, undiscoverable

   not able to be ascertained; resisting discovery

   unpredictable

   unknown in advance

   indeterminate, undetermined

   not precisely determined or established; not fixed or known in advance

   antonyms:

   determinable

   capable of being determined or limited or fixed

   calculable

   capable of being calculated or estimated

   ascertainable, discoverable

   capable of being ascertained or found out

   definable

   capable of being defined, limited, or explained

   judicable

   capable of being judged or decided
2. adjective

   impossible to fix, measure, or calculate
   synonyms:

   incalculable

   not capable of being computed or enumerated