Doe asserts insufficiency of the evidence, claiming that the hearing examiner's decision is 'contrary to common sense' and 'lacks a basis of reasonable expectations.' Doe, 'as the appealing party, has the 'heavy' burden of showing that the agency decision . . . is not supported by substantial evidence.' Zoning Bd. of Appeals of Canton v. Housing Appeals Comm., 76 Mass. App. Ct. 467, 472 (2010), quoting from DSCI Corp. v. Department of Telecomm. & Energy, 449 Mass. 597, 603 (2007). 'Substantial evidence is 'such evidence as a reasonable mind might accept as adequate to support a conclusion." Doe, Sex Offender Registry Bd. No. 10216 v. Sex Offender Registry Bd., 447 Mass. 779, 787 (2006), quoting from G. L. c. 30A, § 1(6). 'This standard is highly deferential to an agency . . . .' Ten Local Citizen Group v. New England Wind, LLC, 457 Mass. 222, 228 (2010).