2 adjectives to describe cud

Of these he chewed the bitter cud while he rode home, wondering with whom Miss Bruce could thus dare to parade herself in public, maddened at the open rebellion inferred by so ignoring his presence and his love, vowing to revenge himself without delay by tightening the curb and making her feel, to her cost, the hold he possessed over her person and her actions.

it's covered with old tabacker cuds, mud, segar stumps, broken whiskey bottles, and dish water.

2 adjectives to describe  cud