Green’s Dictionary of Slang

cap-sick adj.

[fig. use of SE]

drunk, or mentally confused.

[UK]H. Hutton Follies Anatomie (1842) 9: I Their mappes of knavery and shame descry In lively colours, with a sanguine die; / And tell a tale should touch them to the quick; / Shold make them startle; fain themselves cap-sick.