grumbling grumblingly grumblings grumbly grume grumes grumiplucite grumly grummel grummer
| grummest grummet grummeted grummeting grummets grumness (current term) grumose grumous grump grumped
| grumph grumphed grumphie grumphies grumphing grumphs grumphy grumpier grumpiest grumpily
|