All 6 Uses

however
in
City of Heavenly Fire
(Auto-generated)

The darkness did, however, and drew him down and away.†
p. 259.9

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
"And it definitely doesn't mean you're the only one who can kill however many Endarkened Sebastian has standing around him," Clary pointed out.
p. 338.7 *

however = whatever number of
The Endarkened, however, were not weakened.†
p. 574.5 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
"You think about it however you would like to," he said.†
p. 462.6
Cut his throat, pierce his heart—however you like.†
p. 500.9
And then he was kissing her again, sucking her lower lip into his mouth, kissing her throat and mouthing her collarbone as she ran her hands all over him, free in the knowledge that she could touch him, as much as she liked, however she liked.†
p. 527.4 *

Definitions:

(1) (however as in: However, complications may...)
though (or another expression that connects contrasting ideas)

Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 exists, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrast and but.
(2) (however as in: However much she tried...)
to whatever degree (regardless of how much; or whatever unspecified amount)
(3) (however as in: However you do it, get it done!)
in whatever way
(4) (meaning too rare to warrant focus)
Much more rarely (and arguably incorrectly), however can be used to intensify the word how, as when one says "However did you find her?" Grammarians would suggest using two words for that usage: "How ever did you find her?"