Grouty

1746, William Ellis, Agriculture improv'd: or, The practice of husbandry display'd, page 74:... the Wash of the Dung runs into this Pond, and thickens it to that degree, that many have wondered how the Cattle could drink such grouty, black, stinking Water, full of Lice, Worms, Bugs, and other Insects.
1830, William Kitchiner, The Cook's Oracle and Housekeeper's Manual, page 193:Stew no longer than the meat is thoroughly done to eat, and you will obtain excellent broth, without depriving the meat of its nutritious succulence : to boil it to rags, as is the common practice, will not enrich your broths, but make them thick and grouty.

Of uncertain origin; compare grouchy.

1888, in the New Englander and Yale Review, volume 48, page 33:How easy to be kind and pleasant: how uncomfortable to be rude and grouty!
2003, Diane Ayres, Other Girls, page 390:Amanda was fuming. ... But then, the telltale grappling and stumble step backwardâ€”thumpâ€”against the wall, which braced them through the ensuing make-out moment, however brief, until the grouty girl could be heard cooing with pleasure.
2005, Evelyn Richardson, Desired Haven, page 3:Though I suppose if you've no one to love but a grouty old mother, you don't have the worry and fear for your menfolk heavy on you, Mercy conceded.