The best replacement for invalid is invalid.

The best alternatives to invalid are rated as following:
★★★★★  invalid
★★★★  valid
★★★★  unsound
★★★  valid arguments
★★  unsound arguments
★  disabled
★  not valid
★  unsound argument
★  illicit
★  missing sim card
★  void

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No companions for invalid have been suggested so far.
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