| doubter | (noun) someone who habitually doubts accepted beliefs | Synonyms: sceptic, skeptic |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: agnostic |
| subterfuge | (noun) something intended to misrepresent the true nature of an activity | Synonyms: blind |
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| 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 |