適 - suitable, occasional, rare

pleasant; agreeable; comfortable

inadequacy; inappropriateness; unfitness; impropriety

most suitable; optimum; optimal; best

aptitude; aptness; suitability

timely; opportune

application (of a rule, law, method, etc.)

appropriate; suitable; fitting; apt; proper; right; pertinent; relevant

adaptation; accommodation; conformity

proper quantity; suitable amount; proper dose; optimal dose

to fit; to suit

eligible; qualified; competent

conformity; compatibility; adaptability; congruity; congruence