| aboveground | (adjective) on or above the surface of the ground | - |
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| aground | (adjective) stuck in a place where a ship can no longer float | - |
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| belowground | (adjective) underneath the ground | - |
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| (adjective) under the level of the ground | Synonyms: underground |
| groundbreaking | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: innovational, innovative |
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| groundless | (adjective) without a basis in reason or fact | Synonyms: baseless, idle, unfounded, unwarranted, wild |
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| round | (adjective) having the shape or form of a circle | Synonyms: circular |
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| (adjective) (of sounds) full and rich | Synonyms: orotund, pear-shaped, rotund |
| (adjective) (mathematics) expressed to the nearest integer, ten, hundred, or thousand | - |
| roundabout | (adjective) deviating from a straight course | Synonyms: circuitous, devious |
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| (adjective) marked by obliqueness or indirection in speech or conduct | Synonyms: circuitous |
| rounded | (adjective) curving and somewhat round in shape rather than jagged | - |
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| roundheaded | (adjective) having a brachycephalic head | Synonyms: broad-headed, short-headed |
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| roundish | (adjective) somewhat round in appearance or form | - |
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| surrounded | (adjective) confined on all sides | Synonyms: encircled |
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| surrounding | (adjective) closely encircling | Synonyms: circumferent, encompassing |
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| underground | (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover |
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| (adjective) under the level of the ground | Synonyms: belowground |