All 17 Uses of

however
in
The Adventures of Tom Sawyer

However, they worried through, and each got his reward—in small blue tickets, each with a passage of Scripture on it; each blue ticket was pay for two verses of the recitation.
Chpt 4

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.

Tom counted the pages of the sermon; after church he always knew how many pages there had been, but he seldom knew anything else about the discourse. However, this time he was really interested for a little while.
Chpt 5

however = though (used to connect contrasting ideas)

However, it seemed well worth while to chance it, so he fell to groaning with considerable spirit.
Chpt 6

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.

However, even inquests went out of vogue at last, and ceased to torture Tom's conscience.
Chpt 11

However, he reached the shore finally, and drifted along till he found a low place and drew himself out.
Chpt 15

However, one by one they straggled in at last and took shelter under the tent, cold, scared, and streaming with water; but to have company in misery seemed something to be grateful for.
Chpt 16

However, there was no other way; so with such show of cheerfulness as they could muster they called for the pipe and took their whiff as it passed, in due form.
Chpt 16

After a few moments, however, the boy got a little of his strength back, and managed to put enough of it into his voice to make part of the house hear: "In the graveyard!"
Chpt 23

The thing failed this time, however, so the boys shouldered their tools and went away feeling that they had not trifled with fortune, but had fulfilled all the requirements that belong to the business of treasure-hunting.
Chpt 26

However, this sort of close to the day's adventures was romantic and therefore satisfactory.
Chpt 29

He had only thought it was not the treasure, however—he had not known that it wasn't—and so the suggestion of a captured bundle was too much for his self-possession.
Chpt 30 *

however = in whatever way

Their speed was slow, however, because pitfalls were somewhat common, and had to be guarded against.
Chpt 31 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.

It would be complete, however, as soon as the messenger dispatched with the great news to the cave should get the word to her husband.
Chpt 32

Nobody suffered half as much as the two boys did, however.†
Chpt 33

however = a word used to connect contrasting ideas as when using "though", "in spite of that", "in contrast", "nevertheless", etc.

However, the widow made a pretty fair show of astonishment, and heaped so many compliments and so much gratitude upon Huck that he almost forgot the nearly intolerable discomfort of his new clothes in the entirely intolerable discomfort of being set up as a target for everybody's gaze and everybody's laudations.
Chpt 34

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.

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 contrastand 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)
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?"