This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A decrease, decline, or relaxation, as of effort or energy.

n. A disappointment: The cancellation of the game was a real letdown.

n. The descent made by an aircraft in order to land.

n. A physiological response in lactating females, activated usually in response to sucking or crying by an infant, in which milk previously secreted into the alveoli of the breasts is released into the ducts that lead to the nipple.

n. Alternative form of let-down.

n. a feeling of dissatisfaction that results when your expectations are not realized

"Another letdown is a possibility: State's opponent this time is Wisconsin, which handled the Spartans in Madison last season."

dissatisfaction   

defeat    frustration   

fill-up    suppresser    upturn    side-pee    tomisinformation    setback    parthenogenesis    looking-for    worthe    kinesis