What is Incompetent Evidence?

Legal Definition
Evidence that is inadmissible because it is irrelevant or immaterial (has no bearing on the case at hand).
Legal Definition
This si evidence that is not permitted because it comes from a witness who is inadequate or defective.
Legal Definition
Evidence Which is not admissible under the established rules of evidence; evidence which the law does not permit to be presented at all, or in relation to the particular matter, on account of lack of originality or of some defect in the witness, the document, or the nature of the evidence itself. Texas Brewing Co. v. Dickey (Tex. Civ. App.) 43 S. W. 578; Beil v. Bumstead, 60 Hun, 580, 14 N. Y. Supp. 607; Atkins v.' Blwell, 45 N. Y. 757; People v. Mullings, 83 Cal. 138, 23 Pac. 229, 17 Am. St. Rep. 223.
-- Black's Law Dictionary