ANT: Indifference, unconcern, carelessness, ease.
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KEY: Solid.
SYN: Hard, firm, compact, resistant, dense, substantial, weighty, strong, valid, just, sound, impenetrable, stable, cubic.
ANT: Soft, hollow, yielding, frail, brittle, flimsy, elastic, resilient, malleable, impressible, fluid, liquid, frivolous, light, trifling, weak, invalid, unsound, fallacious, weakly.
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KEY: Solitary.
SYN: Sole, single, only, lone, lonely, private, remote, retired, sequestered, desolate, uninhabited, desert, [See ANXIOUS].
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KEY: Solitude.