All 5 Uses

however
in
Allegiant
(Auto-generated)

I, however, think of speeding through the air, high above the compound, and feel like I might throw up.†
p. 113.9 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
I imagine hurtling into the air in a car with wings, the energy of the engine and the rush of wind through all the spaces in the walls and the possibility, however slight, that something will fail and I will plummet to my death.
p. 181.1 *

however = regardless of how
Will, Fernando, Cara—all Erudite, all some of the best people I've known, however briefly.
p. 218.5
I notice, however, that Peter only pretends to inject himself—when he presses the plunger down, the fluid runs down his throat, and he wipes it casually with a sleeve.†
p. 402.1

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
However, we were surprised to discover that the behavioral modification component of our city's experiment was quite effective—up until recently, it actually helped quite a bit with the behavioral problems that made the genetic manipulation so problematic to begin with.†
p. 127.1

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?"