Answer: boniest

AnswerCrossword Clue
BONIEST

Skinny to the max

BONIEST

Hardest to eat, as fish

BONIEST

Least fleshy

BONIEST
Most skinny
BONIEST
Most difficult to fillet
BONIESTMost scrawny.
BONIESTMost emaciated
BONIESTSuperlatively spare
BONIESTMost gaunt
BONIESTMost scrawny