| subterminal | (adjective) near but not precisely at an end | - |
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| subterranean | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterraneous, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterraneous |
| subterraneous | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterranean |
| subtle | (adjective) working or spreading in a hidden and usually injurious way | Synonyms: insidious, pernicious |
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| (adjective) difficult to detect or grasp by the mind or analyze | Synonyms: elusive |
| (adjective) able to make fine distinctions | - |
| subtractive | (adjective) constituting or involving subtraction | - |
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| subtropic | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, semitropical, subtropical |
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| subtropical | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, semitropical, subtropic |
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