Welsh

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Etymology

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From simsan +‎ -rwydd.

Noun

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simsanrwydd m (uncountable, not mutable)

  1. unsteadiness, shakiness
    Synonyms: ansadrwydd, ansefydlogrwydd
  2. (pathology) ataxia, ataxy

Further reading

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  • R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “simsanrwydd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies