无足轻重

• 一(one; initial)ASSOCIATIVE
• 尢(disabled person; insufficient)ASSOCIATIVE

From the beginning there was a shortage, so 無 means 'nothing at all'.

• 足(foot (pictograph))ASSOCIATIVE

A footprint drawing represents a foot and the act of walking.

• 車(vehicle; cart; car)RADICAL
• 巠(underground water stream; subterranean water)PHONETIC

A light vehicle running smoothly on the road conveys the meaning of lightness.

• 里(village; mile)RADICAL
• 千(thousand; many)ASSOCIATIVE

Heavy as carrying a thousand miles of road on your shoulders.