| abstruse | (adjective) difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge | Synonyms: deep, recondite |
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| abstrusely | (adverb) in a manner difficult to understand | - |
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| abstruseness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: obscureness, obscurity, reconditeness |
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| (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstrusity, profoundness, profundity, reconditeness |
| ceruse | (noun) a poisonous white pigment that contains lead | Synonyms: lead carbonate, white lead |
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| cruse | (noun) small jar; holds liquid (oil or water) | - |
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| drusen | (noun) (plural) an eye disease resulting from small accumulations of hyaline bodies underneath the retina | - |
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| overuse | (noun) exploitation to the point of diminishing returns | Synonyms: overexploitation, overutilisation, overutilization |
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| (verb) make use of too often or too extensively | Synonyms: overdrive |
| peruse | (verb) examine or consider with attention and in detail | - |
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| ruse | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: artifice |
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