资料来源 : pyDict

无理由的;无稽的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Unfounded \Un*found"ed\, a.
   1. Not founded; not built or established. --Milton.

   2. Having no foundation; baseless; vain; idle; as, unfounded
      expectations. --Paley.

资料来源 : WordNet®

unfounded
     adj : without a basis in reason or fact; "baseless gossip"; "the
           allegations proved groundless"; "idle fears";
           "unfounded suspicions"; "unwarranted jealousy" [syn: {baseless},
            {groundless}, {idle}, {unwarranted}]