Antonym of ‘Immutable’ (ناقابل تغیر) is: A) Important B) Determinate C) Flexible D) Serene Related MCQs: Insuperable (ناقابل عبور) antonym? Choose the most appropriate meaning of idiom: Does not hold water (ناقابل اعتبار): Ambiguous (مبہم) antonym? The circumference of the Earth is: