不毛之地

• 不(no; not; negation)ASSOCIATIVE

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 毛(hair; feather)ASSOCIATIVE

The character 毛 draws soft hair strands drooping down from skin.

• 之(walk; arrive; step on ground)ASSOCIATIVE

A footstep moving forward on the ground represents "go to," which then becomes a grammatical particle.

• 土(earth; soil; land)RADICAL
• 也(also; punctuation mark (archaic))PHONETIC

The wide earth (soil) is also where all things flourish and grow.