grumly
adjective
grum·ly
ˈgrəmli
-er/-est
now chiefly Scottish
: turbid and troubled
cold and watery grew the wind and grumly grew the sea 
Sir Patrick Spens
Sir Patrick Spens
Word History
Etymology
probably from obsolete English grummel sediment, dregs (probably of Scandinavian origin) + English -y; akin to Swedish grummel sediment, dregs