—adj. 1. not strong; unhealthy; ailing.
2. of, connected with, or arising from ill health: a sickly complexion. 3. marked by the prevalence of ill health, as a region: the epidemic left the town sickly. 4. causing sickness.
6. maudlin and insipid; mawkish: sickly sentimentality. 7. faint or feeble, as light or color.