Synonyms of unnegotiable

1 Syllable

wild

2 Syllables

abstract, unreal, absurd, no-go

3 Syllables

quixotic, romantic, useless, unwise, starry-eyed, nonviable

4 Syllables

illogical, chimerical, visionary, impossible, unusable, improbable, idealistic, impractical, nonfunctional, theoretical, unworkable, infeasible, unfeasible, otherworldly

5 Syllables

speculative, inoperable, inapplicable, ivory-tower, unattainable, irrealizable, inefficacious, unserviceable

6 Syllables

unbusinesslike