All 8 Uses of

however
in
Of Human Bondage

Soon, however, there could be no doubt that there was something between the pair, and other people in the Frau Professor's house saw them lurking in dark places.†
Chpt 29-30

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

In a day or two the answer came back that he had not a vacancy, and was very much opposed to the whole scheme; the profession was greatly overcrowded, and without capital or connections a man had small chance of becoming more than a managing clerk; he suggested, however, that Philip should become a chartered accountant.†
Chpt 33-34

Miss Wilkinson, however, did not write again; nor did she, as he absurdly feared, suddenly appear in Paris to make him ridiculous before his friends.†
Chpt 43-44

It was only a viva, however, and he felt sure that in a fortnight he could find out enough about the subject to scrape through.†
Chpt 59-60

His chief amusement in it, however, was that it showed the beauty of his graceful hands, of which he was excessively proud.†
Chpt 119-120 *

He had been on the staff of an English paper in Paris, but had been dismissed for drunkenness; he still however did odd jobs for it, describing sales at the Hotel Drouot or the revues at music-halls.†
Chpt 45-46

But he finished philosophically enough: "However, I got four portraits out of her, and I'm not sure if the last I was working on would ever have been a success.'†
Chpt 65-66

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?"