banal

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Adjectives:

accumbent, aclinal, agroof, alluvial, applanate, calm, calm as a mill pond, campestral, champaign, couchant, decubital, decumbent, discoid, even, flat, flat as a billiard table, flat as a board, flat as a bowling-green, flat as a flounder, flat as a fluke, flat as a pancake, flat as my hand, flush, horizontal, jacent, level, lying, oblate, planar, plane, procumbent, prone, prostrate, raxed, rectiserial, recumbent, smooth, smooth as glass, supine, ventricumbent