Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
sudden; abrupt; unexpected; immediate
Usually written using kana aloneocc. written 遽か
にわか仕込みの知識ではその問題は解けなかった。Hastily acquired knowledge was not enough to solve the problem. Prefix, Na-adjective (keiyodoshi)
improvised; hasty; impromptu; offhand
Usually written using kana alone
Noun
impromptu skit
Abbreviationocc. written 仁輪加 or 仁和加see 俄狂言
bandwagon fan; fair-weather fan
AbbreviationSlangUsually written using kana alonesee にわかファン
Also written 俄か【にわか】