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Adjective: sickly (sicklier,sickliest)  sik-lee
  1. Unhealthy looking
    - sallow
  2. Somewhat ill or prone to illness
    "a sickly child";
    - ailing, indisposed, peaked, poorly, unwell, under the weather, seedy, off-colour [Brit], out of sorts, crook [Austral, NZ]

Derived forms: sickliest, sicklier

See also: ill, sick, unhealthy