Meaning : Unhealthy looking.
Synonyms : sallow
Meaning : Somewhat ill or prone to illness.
Example :
My poor ailing grandmother.
Feeling a bit indisposed today.
You look a little peaked.
Feeling poorly.
A sickly child.
Is unwell and can't come to work.
Synonyms : ailing, indisposed, peaked, poorly, seedy, under the weather, unwell