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, ยง 1(6). 'This standard is highly deferential to an agency . . . .' Ten Local Citizen Group v. New England Wind, LLC, 457 Mass. 222, 228 (2010).