| subscribed | (adjective) (of a contract or will or other document) having a signature written at the end | - |
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| subscript | (adjective) written or printed below and to one side of another character | Synonyms: inferior |
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| subsequent | (adjective) following in time or order | - |
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| subservient | (adjective) serving or acting as a means or aid | Synonyms: implemental, instrumental |
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| (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: slavish, submissive |
| (adjective) compliant and obedient to authority | - |
| subsidiary | (adjective) functioning in a supporting capacity | Synonyms: auxiliary, supplemental, supplementary |
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| subsidised | (adjective) having partial financial support from public funds | Synonyms: subsidized |
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| subsidized | (adjective) having partial financial support from public funds | Synonyms: subsidised |
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| subsonic | (adjective) (of speed) less than that of sound in a designated medium | - |
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| substandard | (adjective) falling short of some prescribed norm | Synonyms: deficient, inferior |
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| substantial | (adjective) having substance or capable of being treated as fact; not imaginary | Synonyms: material, real |
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| (adjective) of considerable importance, size, or worth | Synonyms: significant |
| (adjective) of or relating to the real nature or essential elements of something | Synonyms: substantive |
| (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, flush, loaded, moneyed, wealthy |
| (adjective) of good quality and condition; solidly built | Synonyms: solid, strong |
| (adjective) providing abundant nourishment | Synonyms: hearty, satisfying, solid, square |
| substantiating | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiative, validating, validatory, verificatory, verifying |
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| substantiative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying |
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| substantival | (adjective) of or relating to or having the nature or function of a substantive (i.e. a noun or noun equivalent) | - |
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| substantive | (adjective) defining rights and duties as opposed to giving the rules by which rights and duties are established | Synonyms: essential |
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| (adjective) of or relating to the real nature or essential elements of something | Synonyms: substantial |
| (adjective) being on topic and prompting thought | Synonyms: meaty |
| substitutable | (adjective) capable of being exchanged for another or for something else that is equivalent | Synonyms: commutable |
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| (adjective) (of words) interchangeable in a given context without changing the import of the expression | - |
| substitute | (adjective) artificial and inferior | Synonyms: ersatz |
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| (adjective) serving or used in place of another | Synonyms: alternate, alternative |
| (adjective) capable of substituting in any of several positions on a team | Synonyms: utility |
| subsurface | (adjective) beneath the surface | - |
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