I remember when I read Eternity, I was sick with grippe at the time and I just got sicker.
We don't file for Chapter 11 when we are ailing—we get sick and then sicker.
First is this: the vaguer the dispatches, the sicker the patient.
Americans are sicker and taking more pills than ever, and our doctors are miserable.
Putting younger workers in the same plans forces them to subsidize the sicker and older.
But he never heard any music, and this, instead of calming his nerves, made him sicker.
John tells me you were sicker than 283 people usually are at such times.
“Your father's sicker than he lets on,” Aunt Maria said, bluntly.
You shall be sicker yet, if you do not speak to some purpose.
And her face turned me sicker as she flung around on me, with her fingers all ashes,—and Paulette's letter in her hand!
"to chase, set upon" (as in command sick him!), 1845, dialectal variant of seek. Used as an imperative to incite a dog to attack a person or animal; hence "cause to pursue." Related: Sicked; sicking.
"unwell," Old English seoc "ill, diseased, feeble, weak; corrupt; sad, troubled, deeply affected," from Proto-Germanic *seukaz, of uncertain origin. The general Germanic word (cf. Old Norse sjukr, Danish syg, Old Saxon siok, Old Frisian siak, Middle Dutch siec, Dutch ziek, Old High German sioh, Gothic siuks "sick, ill"), but in German and Dutch displaced by krank "weak, slim," probably originally with a sense of "twisted, bent" (see crank (n.)).
Restricted meaning "having an inclination to vomit, affected with nausea" is from 1610s; sense of "tired or weary (of something), disgusted from satiety" is from 1590s; phrase sick and tired of is attested from 1783. Meaning "mentally twisted" in modern colloquial use is from 1955, a revival of the word in this sense from 1550s (sense of "spiritually or morally corrupt" was in Old English, which also had seocmod "infirm of mind"); sick joke is from 1958.
"those who are sick," Old English seoce, from sick (adj).
adj. sick·er, sick·est
Suffering from or affected with a disease or disorder.
Of or for sick persons.
Mentally ill or disturbed.
Constituting an unhealthy environment for those working or residing within, as of a building.
The craving and misery of an addict in need of a narcotic dose (1940s+ Narcotics)
[modern use of first sense from about 1955 is probably not a survival]