Congruous, a.
Etymology: [L. congruus, fr. congruere to come together, to coincide, to agree. Of uncertain origin.]
Suitable or concordant; accordant; fit; harmonious; correspondent; consistent. Not congruous to the nature of epic poetry. Blair. It is no ways congruous that God should be always frightening men into an acknowledgment of the truth. Atterbury.
Shades of meaning
Fernald has no entry of its own for congruous; he lists it under becoming.
He lists it without comment; the entries above explain its neighbors.