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Adjective: sickly (sicklier,sickliest)  sik-lee
  1. Unhealthy looking
    - sallow, peaky [Brit, informal]
  2. Somewhat ill, feeling or being in bad health
    "a sickly child";
    - ailing, indisposed, peaked, poorly, unwell, under the weather [informal], seedy [archaic], out of sorts [informal], off-colour [Brit, informal], crook [Austral, NZ, informal], grotty [Brit, informal]

Derived forms: sicklier, sickliest

See also: ill, sick, unhealthy