| zealous | (adjective) marked by active interest and enthusiasm | Synonyms: avid |
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| zenithal | (adjective) relating to or located at or near the zenith | - |
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| zero | (adjective) of or relating to the null set (a set with no members) | - |
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| (adjective) indicating the absence of any or all units under consideration | Synonyms: 0 |
| (adjective) having no measurable or otherwise determinable value | - |
| (adjective) indicating an initial point or origin | - |
| zeroth | (adjective) preceding even the first | - |
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| zestful | (adjective) marked by spirited enjoyment | Synonyms: barmy, yeasty, zesty |
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| zesty | (adjective) marked by spirited enjoyment | Synonyms: barmy, yeasty, zestful |
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| (adjective) having an agreeably pungent taste | Synonyms: piquant, savory, savoury |