Unauthentic
Part of speech: adjective
Definition: Not authentic
Spurious
Part of speech: adjective
Definition: false, not authentic, not genuinebastardly, illegitimate
Unauthentic as an adjective is not authentic while Spurious as an adjective is false, not authentic, not genuine
Part of speech: adjective
Definition: Not authentic
Part of speech: adjective
Definition: false, not authentic, not genuinebastardly, illegitimate
We hope you now know whether to use Unauthentic or Spurious in your sentence.