しらけ

noun, noun which may take the genitive case particle 'no'

disenchantment; apathy; spoiled fun; turn-off

Describes a mood of disillusionment, boredom, or a situation where excitement fades. Often used when something kills the atmosphere or makes people lose interest.

• 彼かれのつまらない冗じょう談だんで場ばがしらけになった。

  His lame joke killed the mood.

• しらけムードが漂ただよっていた。

  There was an air of apathy.