IPA: /ˌʌndɪˈsaɪdəˌbɪlɪti/
KK: /ʌnˌdɪˈsaɪdəˌbɪlɪti/
The condition where a problem cannot be definitively resolved or determined as true or false.
The concept of undecidability is important in computer science and mathematics.
Undecidability → It is formed from "un-" (meaning not), "decidere" (from Latin, meaning to cut off or determine), and "-ability" (meaning the quality of being able to). The word "undecidability" refers to the quality of not being able to determine or decide something.
Think of 'not' ('un-') being able to 'determine' ('decidere') something — that's why undecidability means you cannot make a decision.