Weak, unhealthy, and often sick. (Cambridge Dictionary)
Somewhat unwell. (Merriam – Webster)
Produced by or associated with sickness. (Merriam – Webster)
Producing or tending to produce disease: Unwholesome. (Merriam – Webster)
Appearing as if sick. (Merriam – Webster)
Lacking in vigour: weak. (Merriam – Webster)
A sickly person or animal is weak, unhealthy, and often ill. (Collins Dictionary)
A sickly smell or taste is unpleasant and makes you feel slightly sick, often because it is extremely sweet. (Collins Dictionary)
Often ill; in poor health. (Oxford Dictionaries)
(of a person’s complexion or expression) indicative of poor health. (Oxford Dictionaries)
Examples
Bigstock. Sickly man image.
![](https://medicinalchemistrydotblog.wordpress.com/wp-content/uploads/2019/01/sickly-222.jpg)
https://www.bigstockphoto.com/image-67598293/stock-photo-sickly-man
Believer’s magazine.
“Among” The Corinthians (5): Many Weak and Sickly “Among You”