突然的，骤然的，出乎意料的，即兴的，仓促的，随意的

1. sudden, abrupt, unexpected, improvised, hasty, offhand

nouns which may take the genitive case particle 'no' adjectival nouns or quasi-adjectives (keiyodoshi) noun (common) (futsuumeishi) word usually written using kana alone

即兴小品

2. impromptu skit

noun (common) (futsuumeishi) abbreviation

墙头草球迷

3. bandwagon fan, fair-weather fan

noun (common) (futsuumeishi) abbreviation word usually written using kana alone slang