sickly sickly /ˈsɪkli/

adjective

1. () Unhealthy looking  ( sallow , sickly )
   unhealthy looking
   
2. Somewhat ill or prone to illness  ( indisposed , poorly , seedy , ailing , peaked , sickly , under the weather , unwell )
   somewhat ill or prone to illness
    My poor ailing grandmother
   my poor ailing grandmother
    Feeling a bit indisposed today
   feeling a bit indisposed today
    You look a little peaked
   you look a little peaked
    Feeling poorly
   feeling poorly
    A sickly child
   a sickly child
    Is unwell and can't come to work
   is unwell and can't come to work