(sıfat) çekimsiz

listen to the pronunciation of (sıfat) çekimsiz
Турецкий язык - Английский Язык
indeclinable
not grammatically inflected, especially if others of its class are usually inflected
An indeclinable word
Not declinable; not varied by inflective terminations; as, nihil (nothing), in Latin, is an indeclinable noun
{s} cannot be inflected grammatically; having no grammatical inflection; cannot be declined, that exists in one grammatical form only