verb

1. To make (something) sickly.

2. To become sickly.

adjective

1. Frequently ill or in poor health.

   “a sickly child”

2. Not in good health; (somewhat) sick.

3. (of a plant) Characterized by poor or unhealthy growth.

Synonyms: cloying, saccharine, faint, feeble, insipid, weak, faint, pale

adverb

1. In a sick manner; in a way that reflects or causes sickness.

   “sickly pale; to cough sickly”