Pocket Thesaurus
Antonyms of flat
horizontal, unbroken, low, empty, even, reclining, plane, pancake, flush, deflated, depressed, extended, fallen, prone, prostrate, recumbent, supine, decumbent, planar, procumbent, splay, oblate, collapsed, laid low, outstretched, planate, punctured, spread out, tabular
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