Translation guide
Describes a gradual decrease in intensity, size, or influence, often used for the moon, enthusiasm, or power.
Describing the moon as it appears to decrease in size after a full moon.
Literally 'the moon that is becoming missing/chipped.' This is the most natural way to describe a waning moon in everyday conversation.
今夜は欠けていく月がきれいだ。
The waning moon is beautiful tonight.
Specifically refers to the last quarter moon (waning half-moon). More technical or astronomical.
Describing something like enthusiasm, influence, or power gradually becoming weaker.
Describing a person, group, or idea becoming less influential or popular over time.
Literally 'momentum disappears.' Very natural for describing waning influence or popularity.
その政党は勢いがなくなってきた。
That political party's influence is waning.
衰える (otoroeru) is for a gradual decline in inherent strength or vitality (health, enthusiasm). 弱まる (yowamaru) is for a decrease in force or intensity (wind, pressure). 薄れる (usureru) is for fading of something intangible (memory, interest, light).
下弦の月は明け方に見える。
The waning half-moon is visible at dawn.
Literally 'declining moon.' Poetic or literary, emphasizing the fading or weakening aspect.
衰える月が西の空に沈んでいった。
The waning moon sank into the western sky.
General verb for declining in strength, vigor, or ability. Works for health, power, enthusiasm, etc.
彼の熱意は衰え始めている。
His enthusiasm is waning.
体力が衰えてきた。
My physical strength is waning.
Intransitive verb meaning 'to weaken' or 'to abate.' Often used for wind, rain, or force.
風が弱まってきた。
The wind is waning.
To fade, become dim, or thin out. Commonly used for memories, feelings, or light.
興味が薄れてきた。
My interest is waning.
Formal term for a decline or drop in level, quality, or rate. Suitable for academic or business contexts.
生産性が低下している。
Productivity is waning.
Specifically for popularity dropping. '落ちる' means 'to fall.'
その歌手の人気が落ちている。
That singer's popularity is waning.
Idiomatic: 'one's shadow becomes thin,' meaning one's presence or influence fades.
彼は会社で影が薄くなった。
His influence in the company has waned.