| detractive | (adjective) causing to decrease in importance or value | - |
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| diametral | (adjective) related to or along a diameter | Synonyms: diametric, diametrical |
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| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| nonretractable | (adjective) not capable of being retracted | Synonyms: nonretractile |
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| nonretractile | (adjective) not capable of being retracted | Synonyms: nonretractable |
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| penetrable | (adjective) admitting of penetration or passage into or through | - |
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| (adjective) capable of being penetrated | - |
| penetrating | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrative, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrative |
| penetrative | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrating, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrating |
| retractable | (adjective) capable of being retracted | - |
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| retracted | (adjective) drawn back and in | - |
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| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| retral | (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retrograde |
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| (adjective) at or near or toward the posterior | - |
| tetragonal | (adjective) of or relating to or shaped like a quadrilateral | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| tetrametric | (adjective) of or relating to verse lines written in tetrameter | - |
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| tetravalent | (adjective) having a valence of four | - |
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