What does "sickly" mean?

Additional senses

1. 2.Appearing as if sick; weak; languid; pale. The moon grows sickly at the sight of day. Dryden. Nor torrid summer's sickly smile. Keble.
2. 3.Tending to produce nausea; sickening; as, a sickly smell; sickly sentimentality.
3. 4.In a sick manner or condition; ill. My people sickly [with ill will] beareth our marriage. Chaucer.
4. 5.To make sick or sickly; -- with over, and probably only in the past participle. [R.] Sicklied o'er with the pale cast of thought. Shak. Sentiments sicklied over . . . with that cloying heaviness into which unvaried sweetness is too apt to subside. Jeffrey.