Usually means: Mentally unstable or irrational behavior.
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We found 11 dictionaries that define the word screw loose:

General (9 matching dictionaries)
  1. screw-loose: Vocabulary.com
  2. screw-loose: Dictionary.com
  3. Screw Loose: Wikipedia, the Free Encyclopedia
  4. screw-loose: Rhymezone
  5. Screw Loose: Dictionary of Phrase and Fable (1898)
  6. screw-loose: FreeDictionary.org
  7. screw-loose: Mnemonic Dictionary
  8. screw-loose: TheFreeDictionary.com
  9. screw loose: Wiktionary

Slang (2 matching dictionaries)
  1. screw loose: English slang and colloquialisms used in the United Kingdom
  2. screw loose: Urban Dictionary

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Definitions from Wiktionary (screw loose)

▸ noun:  (slang) A state of insanity or eccentricity.
▸ noun:  (slang, archaic) A state of enmity or disagreement.

Similar:
insane, screwy, screwball, space case, screw, screw-off, crazo, screwee, screwgie, schizo, more...

Opposite:
sane, rational, stable, sound, lucid

Phrases:
have a screw loose, had a screw loose, has a screw loose, having a screw loose, a screw loose, more...

▸ Words similar to screw loose

▸ Usage examples for screw loose

▸ Idioms related to screw loose

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▸ Words that often appear near screw loose

▸ Rhymes of screw loose

▸ Invented words related to screw loose

Similar:
insane, screwy, screwball, space case, screw, screw-off, crazo, screwee, screwgie, schizo, more...

Opposite:
sane, rational, stable, sound, lucid

Phrases:
have a screw loose, had a screw loose, has a screw loose, having a screw loose, a screw loose, more...



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