All 6 Uses

however
in
Queen of Attolia
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He didn't, however, tell her who had broken his ribs or how he'd sprained his knee.†
Chpt 4

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
Galen, however, was not one of Relius's informants.†
Chpt 7
His official duties, however, were nebulous.†
Chpt 10 *
However, the seal was broken.†
Chpt 5
However, the Mede presence off the coast is the real danger, and it has intensified.†
Chpt 11
However, Ephrata is not well defended.†
Chpt 11

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?"