na-adjective, noun which may take the genitive case particle 'no'
sudden; abrupt; unexpected; improvised
Describes something happening quickly and without preparation, often with a nuance of being hasty or offhand. Used for both events and ad-hoc actions.
にわかの雨でずぶ濡れになった。
I got soaked by a sudden rain.
He set off on a trip on a sudden whim.
noun
impromptu skit
Abbreviation of 俄狂言; a short, improvised comic performance. Sometimes written with the ateji 仁輪加.
See also: 俄狂言
祭りでにわかを披露した。
They performed an impromptu skit at the festival.
noun
bandwagon fan; fair-weather fan
Slang abbreviation of にわかファン; refers to someone who suddenly becomes a fan only when something is popular or successful, lacking deep knowledge or loyalty.
See also: にわかファン
優勝した途端ににわかが増えた。
Bandwagon fans increased as soon as they won the championship.