unalterable

You take your dress to the tailor to be altered. He tells you he can't alter it. The dress is unalterable. Something unalterable cannot be changed.

Take the prefix un-, meaning "not". Add it to the word alter, meaning "change." Tack on the suffix -able, meaning "possible." The result? Unalterable, "impossible to change." The things you've done in the past are unalterable. The only things you have the power to change are the things you're doing right now or that you will do in the future. How can you alter things that haven't happened yet? Good question. For all we know, they're unalterable too.

Definitions of unalterable
1

adj not capable of being changed or altered

unalterable resolve”
“an unalterable ground rule”
Synonyms:
inalterable
incurable
unalterable in disposition or habits
final, last
not to be altered or undone
Antonyms:
alterable
capable of being changed or altered in some characteristic

adj of a sentence; that cannot be changed

“an unalterable death sentence”
Synonyms:
incommutable
not subject to alteration or change

adj remaining the same for indefinitely long times

Synonyms:
changeless
unchangeable
not changeable or subject to change

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