Sickly
来自Big Physics
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late Middle English: probably suggested by Old Norse sjúkligr .
wiktionary
From Middle English seekly, sekely, siklich, sekeliche, equivalent to sick + -ly. Possibly a modification of Old English sīcle(“sickly”) and/or derived from Old Norse sjúkligr(“sickly”). Cognate with Dutch ziekelijk, Middle High German siechlich, Danish sygelig, Swedish sjuklig, Icelandic sjúklegur.
etymonline
sickly (adj.)
late 14c., "ill, invalid, habitually ailing," from sick (adj.) + -ly (1). Meaning "causing sickness" in any sense is from c. 1600. Related: Sickliness.
