Immutable

/ɪˈmjuːtəbəl/ adjective medium

Not able to be changed or altered.

The scientists treated the speed of light as an immutable constant in their equations.

Memory Trick

Break it down: 'im-' (not) plus 'mutable' (changeable, as in 'mutate') — immutable is literally 'not able to mutate.'

Antonyms

Ephemeral

Appears In