solid

accurate admirable analytical analytic/analytical blocky block careful close cogent compact concrete concrete convincing credible dense denser determined fatter fat fine firm firm firmly fixed good good hard-bitten hard hardy harder hearty heartiest heavyset homogeneous hulking immovable impenetrable impregnable incompressible learned lump marvelous massive monolithic more analytical more analytical more analytic more accurate more compact more credible more careful more concrete more concrete more practical more proper more telling more rigid more trustworthy more valid most analytic most analytical most analytical most telling most trustworthy neck and neck old palpable physical practical proper puissant realest real 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 telling tenacious thickset thick thick thick tighter tight tightest tough toughest tougher trustworthy/trusty trustier trustiest unanimous unbreakable unbroken undivided unfailing unmovable unwavering unyielding valid veridical well-made well-founded whole