solid

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