Definition of: sickly

(sik′lē) adjective ·li·er, ·li·est
1. Habitually indisposed; ailing; unhealthy: a sickly child.
2. Marked by the prevalence of sickness: a sickly summer.
3. Nauseating; disgusting; also, mawkish; sickening.
4. Pertaining to or characteristic of the sick or sickness: a sickly appearance.
5. Weak– or sick–looking; faint: a sickly moon.
—adverb In a sick manner; poorly.
—v.t. ·lied, ·ly·ing To make sickly or sickish, as in color or complexion.
—sick′li·ly adverb
—sick′li·ness noun