All 7 Uses

however
in
Death and the King's Horseman
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In a night which falls before our eyes
However deep, we do not miss our way.
Chpt 3 *

however = regardless of how
However, it doesn't really interest me.
Chpt 4 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
How my friend would read Desire in my eyes before I knew the cause— However rare, however precious, it was mine.†
Chpt 1
How my friend would read Desire in my eyes before I knew the cause— However rare, however precious, it was mine.†
Chpt 1
At the edge of the cloth-covered floor however the WOMEN take a determined stand and block all further progress of the men.†
Chpt 3
However clearly you try to put it, it is still a barbaric custom.†
Chpt 4
However sunk he was in debt he is no pauper's carrion abandoned on the road.†
Chpt 5

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?"