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 good good hard hard-bitten harder hardy heartiest hearty heavyset homogeneous hulking immovable impenetrable impregnable incompressible learned lump marvelous massive monolithic more accurate more analytic more analytical more analytical more careful more compact more concrete more concrete more credible more practical more proper more rigid more telling more trustworthy more valid 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 sure surest tactile tactual tangible telling tenacious thick thick thick thickset tight tighter tightest tough tougher toughest trustier trustiest trustworthy/trusty unanimous unbreakable unbroken undivided unfailing unmovable unwavering unyielding valid veridical well-founded well-made whole