| sibilant | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, fricative, spirant, strident |
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| sibyllic | (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibylline, vatic, vatical |
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| sibylline | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, kabbalistic, qabalistic |
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| (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibyllic, vatic, vatical |