23 synonyms for shallow such as flimsy, empty, and facile. Shallow is an adjective, and its antonyms are profound, serious, and in-depth.
Empty, facile, flimsy, foolish, frivolous, glib, ignorant, insubstantial, lightweight, oversimplified, schematic, silly, simplistic, skin-deep, slight, superficial, surface, trifling, trivial, unintelligent, unscholarly, and unthinking.