All 4 Uses of

stagnant
in
Anna Karenina

The slanting rays of the sun were still hot; his clothes, soaked through with perspiration, stuck to his body; his left boot full of water weighed heavily on his leg and squeaked at every step; the sweat ran in drops down his powder-grimed face, his mouth was full of the bitter taste, his nose of the smell of powder and stagnant water, his ears were ringing with the incessant whir of the snipe; he could not touch the stock of his gun, it was so hot; his heart beat with short, rapid throbs; his hands shook with excitement, and his weary legs stumbled and staggered over the hillocks and in the swamp, but still he walked on and still he shot.†
Part 6

When he got on to dry ground he sat down, pulled off his boot and emptied it, then walked to the marsh, drank some stagnant-tasting water, moistened his burning hot gun, and washed his face and hands.†
Part 6

In spite of its cafes chantants and its omnibuses, Moscow was yet a stagnant bog.†
Part 7

Definitions:

(1) (stagnant)
not circulating or flowing
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Note that stagnant can also be used as the adjective form of stagnate (not changing - in a negative sense).