All 7 Uses

however
in
Nectar in a Sieve
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The following day, however, the improvement continued, and that night he slept peacefully.†
Chpt 16

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
There would be meals to cook on the journey, however, since we were travelling by bullock cart and expected to be on the road at least two days, and for these I took the hand-made bellows and six cakes of dung.†
Chpt 24 *
And however much they played and were children, still their faces were scored with the knowledge and cares that children should not have, their eyes were knowing and guileful beyond their years.
Chpt 25 *

however = regardless of how
However, if she dissembled she dissembled well; no sign of strain or fear crossed her face, she was as happy as a bird with her son, singing to him, playing with him, ducking and chuckling as if he were the most beautiful baby any woman could have.†
Chpt 20
However, Nathan made the decision and once it was made I felt better for it.†
Chpt 20
In the distance we saw the outline of a temple, not too distant however, with a yellow oil flare burning from the top.†
Chpt 24
The promise of shelter had been kept however: food, and somewhere to sleep.†
Chpt 24

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?"