| defiant | (adjective) boldly resisting authority or an opposing force | Synonyms: noncompliant |
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| deficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: insufficient |
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| (adjective) inadequate in amount or degree | Synonyms: lacking, wanting |
| (adjective) falling short of some prescribed norm | Synonyms: inferior, substandard |
| defiled | (adjective) morally blemished; stained or impure | Synonyms: maculate |
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| definable | (adjective) capable of being defined, limited, or explained | - |
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| defined | (adjective) clearly characterized or delimited | - |
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| (adjective) showing clearly the outline or profile or boundary | Synonyms: outlined |
| definite | (adjective) precise; explicit and clearly defined | - |
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| (adjective) known for certain | - |
| definitive | (adjective) supplying or being a final or conclusive settlement | Synonyms: determinate |
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| (adjective) clearly defined or formulated | Synonyms: unequivocal |
| (adjective) of recognized authority or excellence | Synonyms: authoritative |
| immunodeficient | (adjective) incapable of developing an immune response following exposure to an antigen | - |
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| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indefinite | (adjective) vague or not clearly defined or stated | - |
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| (adjective) not decided or not known | - |
| undefiled | (adjective) (of language) not having its purity or excellence debased | Synonyms: uncorrupted |
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| (adjective) free from stain or blemish | Synonyms: immaculate |
| undefinable | (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: indefinable |
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| undefined | (adjective) not precisely limited, determined, or distinguished | Synonyms: vague |
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