Un-gebígendlíc

According to the Old English Dictionary:

un-gebígendlíc

adj. Inflexible; in grammar, indeclinable :-- Ungebígendlíc inflexibile, Hpt. Gl. 425, 34. Ðás naman synd indeclinabilia, ðæt synd ungebígendlíce .... nugas is ungebígendlíc on declínunge, Ælfc. Gr. 9, 25; Zup. 51, 2-6. un-gebigendlic