Antonyms of adj substitutable

2 senses of substitutable

Sense 1
substitutable -- ((of words) interchangeable in a given context without changing the import of the expression)

INDIRECT (VIA synonymous) -> antonymous -- (of words: having opposite meanings)

Sense 2
commutable, substitutable -- (capable of being exchanged for another or for something else that is equivalent)

INDIRECT (VIA exchangeable) -> unexchangeable -- (not suitable to be exchanged)

Similarity of adj substitutable

2 senses of substitutable

Sense 1
substitutable -- ((of words) interchangeable in a given context without changing the import of the expression)
       => synonymous (vs. antonymous) -- ((of words) meaning the same or nearly the same)

Sense 2
commutable, substitutable -- (capable of being exchanged for another or for something else that is equivalent)
       => exchangeable (vs. unexchangeable) -- (suitable to be exchanged)