OPINION OF THE COURT

Appellant Todd Parsons, Jr., was born in 1980, and suffers from antisocial personality disorder. From September 1995 until November 1998, Parsons received disabled child’s benefits on the basis of his disorder, but the benefits were discontinued in November 1998 when he became an adult. Parsons applied for adult child disability benefits, but an Administrative Law Judge (“ALJ”) denied such benefits after a April 2000 hearing; this denial was subsequently affirmed by the Social Security Administration Appeals Council and the District Court below. Specifically, the ALJ and District Court found that Parsons was not disabled under the Social Security Act because his impairments did not meet or functionally equal the listed requirements for disability, and because he could perform certain unskilled jobs in the national economy.

*869 Although this Court exercises plenary review over the District Court’s decision, it reviews the underlying decision of the ALJ “to determine whether it is supported by substantial evidence.” Newell v. Commissioner of Soc. Sec., 847 F.3d 541, 545 (3rd Cir. 2003). Substantial evidence is more than a mere scintilla, but less than a preponderance. Id. It has often been described as “such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” E.g., id. (quoting Richardson v. Perales, 402 U.S. 389, 401, 91 S.Ct. 1420, 28 L.Ed.2d 842 (1971)). Put another way, substantial evidence is enough evidence to justify denial of a directed verdict to the opposing side if the matter had gone to a jury trial. Reefer v. Barnhart, 326 F.3d 376, 379 (3rd Cir. 2003). Inherent to this deferential standard of review is the rule that even if there is contrary evidence in the record that would justify the opposite conclusion, the ALJ’s decision will be upheld if it is also supported by the evidence. Simmonds v. Heckler, 807 F.2d 54, 58 (3rd Cir. 1986); accord Sykes v. Apfel, 228 F.3d 259, 262 (3rd Cir. 2000).

We affirm substantially for the reasons expressed in the thorough and persuasive opinion of the District Court. We add only the following to underscore our agreement with that decision. Parsons argues that the ALJ understated Parsons’s limitations resulting from his disorder. However, as the District Court cogently explained, Parsons offers no medical evidence or testimony from any practitioner substantiating his alleged inability to work. To the contrary, all of the health providers who opined on Parsons’s mental health testified that Parsons’s disability did not preclude him from working. The only evidence Parsons offers to show that the ALJ understated his limitations is the report of Dr. Bryan Simon, the psychologist who conducted the psychological tests ordered by the ALJ in this case. 1 Dr. Simon’s report stated that Parsons has a “fair” ability to perform in certain areas. Parsons contends that a “fair” ability translates to a “marked” limitation on his ability to perform in those areas. Dr. Simon defined “fair” for the purposes of his testing as “capable of performing the activity satisfactorily some of the time.”

We agree with the District Court that this definition of “fair” falls short of describing a “marked” limitation, and at most describes a “moderate” limitation on Parsons’s ability to work. Since the ALJ’s Vocational Expert (“VE”) confirmed Parsons’s ability to work even assuming moderate limitations, Dr. Simon’s report is of no help to Parsons. Similarly, Parsons’s argument that the ALJ understated the extent of his limitations to the VE by calling them “minimal” is unavailing: the VE’s opinion that Parsons could work would have applied even if Parsons had moderate limitations. The ALJ properly refused to ask the VE to assume that Parsons suffered from greater than moderate limitations because such an assumption would have run counter to the medical evidence. Because substantial evidence undergirds the ALJ’s denial of benefits, we affirm that determination. 2