All 6 Uses of

however

in

Hiroshima, by John Hersey

He did, however, have all sorts of modern equipment: an X— ray machine, diathermy apparatus, and a fine tiled laboratory.†
Chpt 1

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

One feeling they did Seem to share, however, was a curious kind of elated community spirit, something like that of the Londoners after their blitz — a pride in the way they and their fellow-survivors had stood up to a dreadful ordeal.†
Chpt 4

' Many citizens of Hiroshima, however, continued to feel a hatred for Americans which nothing could possibly erase.†
Chpt 4 *

She was, however, warmed and healed by the priest's faithfulness to her, for it was obvious that he, too, was weak and in pain, yet he walked great distances to see her.†
Chpt 5

She thought, however, that she knew just the person who might: Norman Cousins, the editor of The Saturday Review of Literature.†
Chpt 5

...However, in his desire to enhance his own prestige and importance he might ignorantly, innocently, or purposefully lend himself to or pursue a leftist line.†
Chpt 5

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