| sec | (adjective) (of champagne) moderately dry | Synonyms: unsweet |
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| secluded | (adjective) hidden from general view or use | Synonyms: privy, secret |
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| (adjective) providing privacy or seclusion | Synonyms: cloistered, reclusive, sequestered |
| second | (adjective) a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first | - |
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| (adjective) coming next after the first in position in space or time or degree or magnitude | Synonyms: 2d, 2nd |
| secondary | (adjective) being of second rank or importance or value; not direct or immediate | - |
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| (adjective) depending on or incidental to what is original or primary | - |
| (adjective) inferior in rank or status | Synonyms: junior-grade, lower-ranking, lowly, petty, subaltern |
| (adjective) not of major importance | - |
| (adjective) belonging to a lower class or rank | - |
| secondhand | (adjective) previously used or owned by another | Synonyms: used |
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| (adjective) derived from what is primary or original; not firsthand | - |
| secret | (adjective) the next to highest level of official classification for documents | - |
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| (adjective) not open or public; kept private or not revealed | - |
| (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, occult, orphic |
| (adjective) not expressed | Synonyms: private |
| (adjective) (of information) given in confidence or in secret | Synonyms: confidential |
| (adjective) not openly made known | Synonyms: unavowed |
| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, undercover, underground |
| (adjective) designed to elude detection | Synonyms: hidden |
| (adjective) indulging only covertly | - |
| (adjective) hidden from general view or use | Synonyms: privy, secluded |
| (adjective) communicated covertly | - |
| secretarial | (adjective) of or relating to a secretary or to a secretary's work | - |
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| secretive | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, closemouthed, tightlipped |
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| secretory | (adjective) of or relating to or producing a secretion | - |
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| sectarian | (adjective) of or relating to or characteristic of a sect or sects | - |
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| sectional | (adjective) relating to or based upon a section (i.e. as if cut through by an intersecting plane) | - |
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| (adjective) consisting of or divided into sections | Synonyms: sectioned |
| (adjective) related or limited to a distinct region or subdivision of a territory or community or group of people | - |
| sectioned | (adjective) consisting of or divided into sections | Synonyms: sectional |
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| sectorial | (adjective) relating to or resembling a sector | - |
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| secular | (adjective) of or relating to clergy not bound by monastic vows | - |
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| (adjective) not concerned with or devoted to religion | Synonyms: profane |
| (adjective) characteristic of or devoted to the temporal world as opposed to the spiritual world | Synonyms: temporal, worldly |
| (adjective) of or relating to the doctrine that rejects religion and religious considerations | - |
| (adjective) characteristic of those who are not members of the clergy | Synonyms: laic, lay |
| secure | (adjective) free from fear or doubt; easy in mind | Synonyms: unafraid, untroubled |
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| (adjective) free from danger or risk | - |
| (adjective) not likely to fail or give way | - |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, strong, unassailable, unattackable |
| (adjective) financially safe | Synonyms: dependable, good, safe |