What is the synonym for sick?

The synonym for "sick" depends on the context. Here are a few possibilities:

If you're talking about being ill:

* Ailing

* Unwell

* Indisposed

* Infirm

* Ill

* Diseased

* Under the weather

* Run down

If you're talking about something unpleasant:

* Repulsive

* Disgusting

* Nauseating

* Loathsome

If you're talking about something that makes you feel nauseous:

* Queasy

* Nauseated

* Sick to one's stomach

If you're talking about someone being mentally ill:

* Mentally unstable

* Disturbed

* Unhinged

* Deranged

It's important to choose the most appropriate synonym depending on the context and the specific meaning you want to convey.