Definition of "cafard"

That's the worst trouble with the soldiers in the trenches — nothing to do. It gives them the cafards, the black butterflies, the blue devils, the jimjams, the hump.

1918, Elizabeth Frazer, Old Glory and Verdun, page 169

At such times when the cafard of the city seized her, I was at my wits' end to devise a means of rousing her.

1957, Lawrence Durrell, Justine