| decideable | (adjective) capable of being decided as following or not following from the axioms of a logical system | - |
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| decided | (adjective) recognizable; marked | Synonyms: distinct |
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| deciding | (adjective) having the power or quality of deciding | Synonyms: determinant, determinative, determining |
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| deciduous | (adjective) (of plants and shrubs) shedding foliage at the end of the growing season | - |
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| (adjective) (of teeth, antlers, etc.) being shed at the end of a period of growth | - |
| decimal | (adjective) numbered or proceeding by tens; based on ten | Synonyms: denary |
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| decipherable | (adjective) easily deciphered | Synonyms: clear, readable |
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| deciphered | (adjective) converted from cryptic to intelligible language | - |
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| decisive | (adjective) determining or having the power to determine an outcome | - |
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| (adjective) characterized by decision and firmness | - |
| (adjective) forming or having the nature of a turning point or crisis | Synonyms: critical |
| (adjective) unmistakable | - |
| duodecimal | (adjective) based on twelve | - |
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| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| indecisive | (adjective) not definitely settling something | - |
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| (adjective) characterized by lack of decision and firmness | - |
| (adjective) not clearly defined | - |
| undecideable | (adjective) not capable of being decided as following or not following from the axioms of a logical system | - |
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| undecided | (adjective) characterized by indecision | Synonyms: on the fence |
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| (adjective) not yet having made a commitment | - |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undetermined, unresolved |
| undecipherable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, unreadable |
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| undeciphered | (adjective) not deciphered | - |
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