3. To become disgusting or tedious. The toiling pleasure sickens into pain. Goldsmith.

4. To become weak; to decay; to languish. All pleasures sicken, and all glories sink. Pope.

SICKENING
Sick"en*ing, a.

Defn: Causing sickness; specif., causing surfeit or disgust;
nauseating.
— Sick"en*ing*ly, adv.

SICKER
Sick"er, v. i. Etym: [AS. sicerian.] (Mining)

Defn: To percolate, trickle, or ooze, as water through a crack. [Also written sigger, zigger, and zifhyr.] [Prov. Eng.]

SICKER; SIKER
Sick"er, Sik"er, a. Etym: [OE. siker; cf. OS. sikur, LG. seker, D.
zeker, Dan. sikker, OHG. sihhur, G. sicher; all fr. L. securus. See
Secure, Sure.]

Defn: Sure; certain; trusty. [Obs. or Prov. Eng. & Scot.] Burns.
When he is siker of his good name. Chaucer.

SICKER; SIKER
Sick"er, Sik"er, adv.

Defn: Surely; certainly. [Obs.]
Believe this as siker as your creed. Chaucer.
Sicker, Willye, thou warnest well. Spenser.