1. empty; hollow
2. fictious; unreal; impractical; vain and useless (efforts, etc.); ineffective
3. high and vast
4. the sky; the space
5. (in Buddhism) sunyata, empty, void vacant, non-existent
6. a Chinese family name

the sky; the firmament; the void

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1. leisure; spare time
2. blank (space); vacant; vacancy; to leave blank or vacant
3. spacious - implying a sense of awe
4. chance; opportunity
5. wanting; deficient; impoverished

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The birds are flying in the sky.

Is the sky blue or cyan?

☺