| cerulean | (adjective) of a deep somewhat purplish blue color similar to that of a clear October sky | Synonyms: azure, bright blue, sky-blue |
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| clean | (adjective) free from dirt or impurities; or having clean habits | - |
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| (adjective) (of behavior or especially language) free from objectionable elements; fit for all observers | Synonyms: unobjectionable |
| (adjective) not spreading pollution or contamination; especially radioactive contamination | Synonyms: uncontaminating |
| (adjective) ritually clean or pure | - |
| (adjective) free from clumsiness; precisely or deftly executed | Synonyms: neat |
| (adjective) free from sepsis or infection | Synonyms: uninfected |
| (adjective) thorough and without qualification | - |
| (adjective) without difficulties or problems | - |
| (adjective) (of a surface) not written or printed on | Synonyms: blank, white |
| (adjective) exhibiting or calling for sportsmanship or fair play | Synonyms: sporting, sportsmanlike, sporty |
| (adjective) (of a manuscript) having few alterations or corrections | Synonyms: fair |
| (adjective) morally pure | Synonyms: clean-living |
| (adjective) (of a record) having no marks of discredit or offense | - |
| (adjective) free from impurities | Synonyms: fresh |
| (adjective) free of drugs | - |
| (adjective) not carrying concealed weapons | - |
| (adjective) free of restrictions or qualifications | Synonyms: clear |
| (adjective) (of sound or color) free from anything that dulls or dims | Synonyms: clear, light, unclouded |
| herculean | (adjective) extremely difficult; requiring the strength of a Hercules | - |
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| (adjective) displaying superhuman strength or power | Synonyms: powerful |
| lean | (adjective) lacking in mineral content or combustible material | - |
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| (adjective) lacking excess flesh | Synonyms: thin |
| (adjective) not profitable or prosperous | - |
| (adjective) containing little excess | Synonyms: skimpy |
| mephistophelean | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelian |
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| unclean | (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: impure |
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| (adjective) soiled or likely to soil with dirt or grime | Synonyms: dirty, soiled |