1. (a.) Possessing firmness or fixedness; firm; hard; solid.

2. (a.) Having agreement with itself or with something else; having harmony among its parts; possessing unity; accordant; harmonious; congruous; compatible; uniform; not contradictory.

3. (a.) Living or acting in conformity with one's belief or professions.

accordant affirmative agreeable agreeing alike answerable at one authoritative automatic balanced binding clean-cut clear clear as crystal clear as day clear-cut coexistent coexisting cogent coherent coincident coinciding commensurate compatible concordant concurring conformable conforming congenial congruent congruous connected consecutive consentaneous consentient consonant constant continuous cooperating cooperative correspondent corresponding crisp crystal-clear crystalline defined definite dependable devoted direct distinct en rapport equable equal equivalent even explicit express faithful firm flat good harmonious homogeneous immutable in accord in agreement in harmony in keeping in rapport in sync in synchronization inaccordance inharmony invariable joined just lawful legal legitimate level like-minded limpid logical loud and clear loyal lucid luminous marble-constant measured mechanical methodic monolithic of a piece of like mind of one mind on all fours ordered orderly pellucid persistent perspicuous plain positive predictable proportionate reconcilable regular robotlike self-consistent sequent sequential serial simple smooth solid sound stable staunch steadfast steady straightforward substantial sufficient symbiotic sympathetic synchronized synchronous systematic tight translucent transparent transpicuous TRUE true-blue unambiguous unanimous unbroken unchangeable unchanged unchanging unconfused undeviating undifferentiated undiversified unequivocal unfailing uniform uninterrupted unisonant unisonous univocal unmistakable unruffled unswerving unvaried unvarying valid weighty well-defined well-founded well-grounded