A type of joint that does not allow movement between bones.

Something that is fixed or unchangeable.

कुछ ऐसा जो स्थिर या अव्यवस्थित है।

English Usage: His decision was immovable despite the arguments presented.

Hindi Usage: उसके निर्णय अचल थे भले ही तर्क प्रस्तुत किए गए।