一虚一盈

いっきょいちえい

constantly changing phase and being highly unpredictable

充盈

じゅうえい

filling (something up)

虧盈

waxing and waning

盈虧

えいき

waxing and waning, phases of moon

満盈

being completely full

虚

うろ うつお うつほ うつせ きょ

falsehood

虚業

きょぎょう

risky business

虚位

きょい

nominal rank

虚実

きょじつ

truth or falsehood

虚聞

きょぶん

false rumor, false rumour, false reputation

虚血

きょけつ

ischemia, ischaemia

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)

虚字

きょじ

kanji representing verb or adjective

虚報

きょほう

false alarm

虚礼

きょれい

empty (useless) formalities

虚飾

きょしょく

ostentation, show, affectation

虚辞

きょじ

falsehood

太虚

たいきょ

the sky, the universe

虚学

きょがく

the soft sciences (social science, humanities, etc.)