无限期

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

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

• 阝(mound; region of land)RADICAL
• 艮(stop; firm)PHONO-SEMANTIC

A tall earthen wall stands firmly to block everything and create an impassable boundary.

• 其(that; that one)PHONETIC
• 月(moon; month)RADICAL

Watch the moon's phases wax and wane to count periods of time.