logically connected; consistent

a coherent argument.

cohering; sticking together

a coherent mass of sticky candies.

having a natural or due agreement of parts; harmonious

a coherent design.

Physics, Optics . of or pertaining to waves that maintain a fixed phase relationship, as in coherent light.

adjective

disorganized , incomprehensible , irrational , not understandable , unintelligible , unrational , unsystematic

adjective

articulate , comprehensible , consistent , identified , intelligible , logical , lucid , meaningful , orderly , organized , rational , reasoned , sound , systematic , clear , understandable