All 9 Uses

however
in
Obasan
(Auto-generated)

Grandma, however, is content.†
Chpt 9

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
The majority are decent, however.†
Chpt 14

however = a word used to connect contrasting ideas as when using "though", "in spite of that", "in contrast", "nevertheless", etc.
I will not cry however much this nurse yanks my hair.
Chpt 22

however = regardless of how
They were branded, however, as theorists, visionary idealists, purists, talkers of academic nonsense, weepers of crocodile tears.†
Chpt 29 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
Obasan, however, does not come from this clamorous climate.†
Chpt 34
"In the heat of the August sun," Grandma writes, "however much the effort to forget, there is no forgetfulness."
Chpt 37 *

however = regardless of how
Tomio, however, was not like Stephen at all.†
Chpt 37

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
However long the hair stays hair, Stephen swears Miss Pye never tells lies.†
Chpt 24
However, the child is a national of Japan and as such is inadmissible under existing immigration regulations.†
Chpt 32

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?"