solid

accurate admirable analytic/analytical analytical blocky block careful close cogent compact concrete concrete convincing credible denser dense determined fatter fat fine firm firm firmly fixed good good hard hard-bitten harder hardy heartiest heavyset hearty homogeneous hulking immovable impenetrable impregnable incompressible learned lump marvelous massive monolithic more accurate more analytical more analytical more analytic more careful more credible more compact more concrete more concrete more practical more proper more rigid more trustworthy more valid more telling most analytic most analytical most analytical most telling most trustworthy neck and neck old palpable physical practical proper puissant real realest reliable remarkable rigid ripping rocky rocky rotund round satisfactory secure secure set solvent sound sound sound stable stalwart steady stiff stocky straight strong substantial substantial substantial superb surest sure tactile tactual tangible tenacious telling thickset thick thick thick tightest tight tighter toughest tougher tough trustier trustworthy/trusty trustiest unanimous unbreakable unbroken undivided unfailing unmovable unwavering unyielding valid veridical well-founded well-made whole