Synonyms and related words :
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