Etymology
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sickly (adj.)

late 14c., "ill, invalid, habitually ailing," from sick (adj.) + -ly (1). Meaning "causing sickness" in any sense is from c. 1600. Related: Sickliness.

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Definitions of sickly

sickly (adj.)
somewhat ill or prone to illness;
a sickly child
Synonyms: ailing / indisposed / peaked / poorly / unwell / under the weather / seedy
sickly (adj.)
unhealthy looking;
Synonyms: sallow
From wordnet.princeton.edu