1) Bumpy, like tires 2) Having knobs 3) Having protuberances 4) Knobbly 5) Like some knees 6) Like some tree trunks 7) Like unsightly knees 8) Not smooth 9) Shaped like a knob 10) Tuberous 11) Unshapely 1) Gnarled 2) Knobbly 3) Knotted 4) Nodal 5) Unshapely 
tire tread with studs for off-road traction; as a pair of knobbies.
• (a.) Irregular; stubborn in particulars. • (a.) Full of, or covered with, knobs or hard protuberances. • (a.) Abounding in rounded hills or mountains; hilly.
Knob'by adjective [ From Knob .] 1. Full of, or covered with, knobs or hard protuberances. Dr. H. More. 2. Irregular; stubborn in particulars. [ Obsolete] « The informers continued in a knobby kind of obstinacy.» Howell. 3. Abounding...
[adj] - having knobs
knobbly adjective having knobs; `had knobbly knees`
full of or covered with knobs: the knobby trunk of a tree. · shaped like a knob.