sue. Belk, Inc. v. Meyer Corp., 679 F.3d 146, 152 n.4 (4th Cir. 2012). We have further found arguments waived even though they might have had merit. See IGEN Intl, Inc. v. Roche Diagnostics GmbH, 335 F.3d 303, 308-09 (4th Cir. 2003); Pleasurecraft Marine Engine Co. v. Thermo Power Corp., 272 F.3d 654, 657 (4t