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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Somewhat sick; disposed to illness; attended with disease; as, a sickly body. This physic but prolongs thy sickly days. (Shak)

2. Producing, or tending to, disease; as, a sickly autumn; a sickly climate.

3. Appearing as if sick; weak; languid; pale. The moon grows sickly at the sight of day. (Dryden) Nor torrid summer's sickly smile. (Keble)

4. Tending to produce nausea; sickening; as, a sickly smell; sickly sentimentality.

Synonym: diseased, ailing, infirm, weakly, unhealthy, healthless, weak, feeble, languid, faint.

Origin: Sicklier; Sickliest.