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adj. sick·li·er, sick·li·est
1. Prone to sickness.
2. Of, caused by, or associated with sickness: a sickly pallor.
3. Conducive to sickness: a sickly climate.
4. Causing nausea; nauseating.
5. Lacking vigor or strength; feeble or weak: a sickly handshake.
tr.v. sick·lied, sick·ly·ing, sick·lies
Archaic To make sickly.

sick′li·ness n.
sick′ly, sick′li·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
"And thus," says Hamlet, "the native hue of resolution / Is sicklied o'er with the pale cast of thought." He is berating himself for not doing anything about his father's murder when his soliloquy is interrupted by his virginal female foil, the dutiful daughter and future suicide.