wane

Things that wane simply grow smaller. "My initial enthusiasm for helping waned when I saw the massive pile of envelopes that needed sealing."

Things that wax and wane, like the moon, grow larger and smaller. Wax is the opposite of wane. A fad, or a fashion, or even a disease, that is on its way out the door is "on the wane." If your influence over your little brother wanes, he’ll probably stop copying you. Anything that wanes, like the moon, influence, or a feeling, has started to go away.

Definitions of wane
  1. noun
    a gradual decline (in size or strength or power or number)
    synonyms: ebb, ebbing
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    type of:
    decline, diminution
    change toward something smaller or lower
  2. verb
    grow smaller
    “Interest in the project waned
    synonyms: decline, go down
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    types:
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    dip
    go down momentarily
    wear on
    pass slowly (of time)
    drop
    go down in value
    fall off, sink, slump
    fall heavily or suddenly; decline markedly
    tumble
    fall suddenly and sharply
    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
  3. verb
    become smaller
    “Interest in his novels waned
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    Antonyms:
    climb, mount, rise, wax
    go up or advance
    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
  4. verb
    decrease in phase
    “the moon is waning
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    Antonyms:
    full, wax
    increase in phase
    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
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