adamantine admissible authoritative binding bulky calculable cogent confirmed consistent credible deep-dyed deep-engraven deep-fixed deep-grounded deep-laid deep-rooted deep-seated deep-set deep-settled dense dependable durable dyed-in-the-wool embedded embossed enduring engrafted engraved entrenched established etched faithful faithworthy fast firm firmly established good graven hard heavy implanted impressed imprinted indelibly impressed infixed ingrained ingrown inveterate invincible inwrought just justifiable lasting lawful legal legitimate logical long-established massive old-line on a rock on bedrock plausible predictable rational reasonable reliable rooted rugged sane secure self-consistent sensible set settled solid sound stabilized stable staunch steadfast steady stout strong sturdy substantial sufficient sure surefire tough trustworthy trusty unfailing unyielding valid vested weighty well-argued well-built well-constructed well-educated well-established well-founded well-informed well-made well-posted well-read well-set well-settled well-versed wholesome widely read