sickly

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Prone to sickness.
2. adj. Of, caused by, or associated with sickness: a sickly pallor.
3. adj. Conducive to sickness: a sickly climate.
4. adj. Causing nausea; nauseating.
5. adj. Lacking vigor or strength; feeble or weak: a sickly handshake.
6. v. To make sickly: "Timidity . . . sicklies the whole cast of thought in action” ( Henry Adams).

Century Dictionary and Cyclopedia

1. Habitually ailing or indisposed; not sound or strong as regards health or natural vigor; liable to be or become sick: as, a sickly person, animal, or plant; a sickly family.
2. Pertaining to or arising from a state of impaired health; characteristic of an unhealthy condition: as, a sickly complexion; the sickly look of a person, an animal, or a tree.
3. Pertaining to sickness or the sick; suitable for a sick person.
4. Marked by the presence or prevalence of sickness: as, a sickly town; the season is very sickly.
5. Causing sickness, in any sense; producing malady, disease, nausea, or disgust; debilitating; nauseating; mawkish: as, a sickly climate; sickly fogs; sickly fare.
6. Manifesting a disordered or enfeebled condition of mind; mentally unsound or weak: as, sickly sentimentality.
7. Synonyms Unwell, Ill, etc. See sick.
8. In a sick, sickly, or feeble manner; so as to show ill health or debility.
9. To make sickly; give a sickly or unhealthy appearance to.

Wiktionary

1. adj. Frequently ill; often in poor health; given to becoming ill.
2. adj. Having the appearance of sickness or ill health; appearing ill, infirm or unhealthy; pale.
3. adj. Weak; faint; suggesting unhappiness.
4. v. transitive To make sickly.

GNU Webster's 1913

1. adj. Somewhat sick; disposed to illness; attended with disease.
2. adj. Producing, or tending to, disease.
3. adj. Appearing as if sick; weak; languid; pale.
4. adj. Tending to produce nausea; sickening.
5. adv. In a sick manner or condition; ill.
6. v. rare To make sick or sickly; -- with over, and probably only in the past participle.

WordNet 3.0

1. adj. unhealthy looking
2. adj. somewhat ill or prone to illness