solid

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