coherente

coherent; consistent

Su explicación no es coherente: se contradice varias veces. His explanation isn't coherent: it contradicts itself several times.

Necesitamos un plan coherente, no una lista de ideas sueltas. We need a coherent plan, not a list of loose ideas.

consistent (true to one's principles)

Es coherente con sus ideas: vive como predica. She is true to her ideas: she practises what she preaches.