Marked by the occurrence of illness or disease (of a period of time).
Tending to produce disease or poor health.
Verb
To make (something) sickly.
To become sickly.
Adverb
In a sick manner; in a way that reflects or causes sickness.
Origin
From Middle English seekly, sekely, siklich, sekeliche, equivalent to sick + -ly. Possibly a modification of Old English sīcle and/or derived from Old Norse sjúkligr. Cognate with Dutch ziekelijk, Middle High German siechlich, Danish sygelig, Swedish sjuklig, Icelandic sjúklegur.
Modern English dictionary
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