虚 （キョ） unpreparedness, falsehood, Chinese "Emptiness" constellation (one of the 28 mansions)

虚偽 （キョギ） falsehood, untruth, lie, misinformation, fallacy

盈虚 （エイキョ） waxing and waning (of the moon), phase, rising and falling (of fortune)

太虚 （タイキョ） the sky, the heavens, Great Void (in ancient Chinese philosophy, the primordial substance that gives rise to qi)

虚偽 （キョギ） falsehood, untruth, lie, misinformation, fallacy

虚空 （コクウ） empty space, empty sky

虚しい （むなしい） empty, void, vacant, vain, fruitless, futile, ineffective, lifeless

虚ろ （うつろ） cavity, hollow, void, hollow (voice, smile, etc.), blank (eyes, look, etc.), vacant (expression, stare, etc.), empty (words, heart, etc.)

虚舟 （うつろぶね） unidentified craft said to have washed ashore in Ibaraki Prefecture during the Edo period (sometimes alleged to have been a UFO)