coherent — If something is coherent, it is well planned, so that it is clear and sensible and all its parts go well with each other.
inherent — existing in someone or something as a permanent and inseparable element, quality, or attribute; inhering: an inherent distrust of strangers.
Four-or-more syllable rhymes
incoherent — without logical or meaningful connection; disjointed; rambling: an incoherent sentence.