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In persistently poor health, infirm, sick all of the time.

By extension, looking sick or unhealthy.
It didn't matter if a prince or princess was ugly or sickly or the village idiot; as long as they were of royal blood, uncontaminated with that of commoners, that was all that mattered.

Carlos II of Spain is a case point for that problem; in delicate health, retarded, impotent, and terribly ugly, Carlos was the end result of generations of inbreeding among the Spanish Habsburgs.

She was a sickly little girl; her nose was always running and she coughed a lot.
sickly by Lorelili January 1, 2011
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1. When someone looks way too thin to be healthy
2. Someone who is normally good looking but looks peculiarly bad either because they are ill or from lack of trying to look presentable
1. eewww look how skinny that girl is... she looks sickly
2. how do you feel? you're looking a little sickly today
3. you better put some makeup on or you'll look sickly
sickly by Nina D June 21, 2007
so sick that not even the word sick can describe something so sick
That was the sickliest wave ever.

Damn, that blowjob was sickly.
sickly by bilbo froggy January 28, 2003
sickly by Amit Shah November 3, 2003
dude that shirt is sickly
Sickly by roldaaaannn August 2, 2021
When you drink 30 Busch peaches and decide to call the biggest sket you know.
Chase: *slurring* I’m calling Alexis

Fitz: “you are sickly”
Sickly by Luke Hackert December 1, 2024

sickly dickly

When a person has absolutely no interest in fucking and there’s nothing that can be done to change it, no matter what.
Well dearest, of course it’s a very special day for the two of us, but I’m afraid that this is a commonplace case of sickly dickly.
sickly dickly by Dr Bunnygirl September 2, 2019