| blue | (adjective) of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky | Synonyms: blueish, bluish |
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| (adjective) filled with melancholy and despondency | Synonyms: depressed, dispirited, down, down in the mouth, downcast, downhearted, gloomy, grim, low-spirited, low |
| (adjective) causing dejection | Synonyms: dark, dingy, disconsolate, dismal, drab, drear, dreary, gloomy, grim, sorry |
| (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, aristocratical, blue-blooded, gentle, patrician |
| (adjective) morally rigorous and strict | Synonyms: puritanic, puritanical |
| (adjective) used to signify the Union forces in the American Civil War (who wore blue uniforms) | - |
| (adjective) suggestive of sexual impropriety | Synonyms: gamey, gamy, juicy, naughty, racy, risque, spicy |
| (adjective) characterized by profanity or cursing | Synonyms: blasphemous, profane |
| (noun) any of numerous small butterflies of the family Lycaenidae | - |
| (noun) the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic | Synonyms: amobarbital sodium, Amytal, blue angel, blue devil |
| (noun) blue clothing | - |
| (noun) blue color or pigment; resembling the color of the clear sky in the daytime | Synonyms: blueness |
| (noun) any organization or party whose uniforms or badges are blue | - |
| (noun) the sky as viewed during daylight | Synonyms: blue air, blue sky, wild blue yonder |
| (noun) used to whiten laundry or hair or give it a bluish tinge | Synonyms: blueing, bluing |
| (verb) turn blue | - |