Thesaurus: synonyms and related words
- a leopard can't/doesn't change its spots idiom
- be no hard and fast rules idiom
- burn your boats/bridges idiom
- congenital
- deep-seated
- fixity
- hard line
- hard line
- immutable
- incorrigible
- incurable
- irreducible
- irremediable
- irreparable
- irretrievable
- irreversible
- ossify
- stuck
- uncompromising
- what's done is done idiom
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