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unextensible
unextensible adj. 
/ˌʌnɛkˈstɛnsᵻbl/, /ˌənɛkˈstɛnsəb(ə)l/
Brit. /ˌʌnᵻkˈstɛnsᵻbl/
, /ˌʌnᵻkˈstɛnsᵻbl//ˌʌnɛkˈstɛnsᵻbl/U.S. /ˌənᵻkˈstɛnsəb(ə)l/
, /ˌənᵻkˈstɛnsəb(ə)l//ˌənɛkˈstɛnsəb(ə)l/ΚΠ
1827 J. Bentham Rationale Judicial Evid. IV. ix. ii. vii. 599 The limited and unextensible quantity of time allowed.
1997 J. Sametinger Software Engin. with Reusable Components xii. 155 Any additions have to be incorporated into the structure of the existing system..without yielding to an unmanageable, unextensible and unmaintainable system.
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