空

empty / sky / void / vacant / vacuum

Part of:

• 控 withdraw
• 倥 boorish
• 啌 angry voice
• 椌 type of ancient musical instrument
• 箜 type of harp
• 腔 body cavity
• 躻

Synonyms:

• 無 nothingness
• 虚 void

Antonyms:

• 塞 close
• 込 crowded

Similar:

• 究 research