All 9 Uses

however
in
A Walk Across America
(Auto-generated)

Cooper, however, clawed at the tent floor to tell me he wanted out into his dream world.†
Chpt 5

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
It had a stove, however, an iron potbellied stove full of burning coal that drew me like a magnet.†
Chpt 6
Cooper, however, had his snacks: I always carried a supply of dog biscuits in my pack.†
Chpt 7
But however it felt, it smelled good.†
Chpt 13 *

however = in whatever way
This Sunday, however, Mary Elizabeth called her boys through the cardboard-thin walls of the trailer, "Come on, everybody up!†
Chpt 13

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
When I got to Selma, however, I found that a lot of changes had taken place.†
Chpt 25 *
However, when 5387 cans of beer, 231 pints of whiskey and 38 gallons of gut-dissolving moonshine are all seized, then "that damn Yankee squealer has got to go."†
Chpt 15
However he had changed, all I wanted to do was guzzle my Budweiser and get away from these men.†
Chpt 24
However, all I had to do was stand up since I was already by the platform.†
Chpt 28

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?"