G2R1U1M3B3L1I1N1G2
15 points
GRUMBLING is validvalid
a complaint [n GRUMBLINGS] / GRUMBLE, to mutter in discontent [v]
muttering in discontent [adj GRUMBLINGLY] / the act of grumbling [n -S]
a complaint [n GRUMBLINGS] / GRUMBLE, to mutter in discontent [v]
muttering in discontent [adj GRUMBLINGLY] / the act of grumbling [n -S]