solid

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