Denshi Jisho — Online Japanese dictionary

浮く うく 1: to float;
2: to become merry; to be cheerful;
3: to become loose; to become unsteady;
4: (Colloquialism) to feel out of it; to be cut off (e.g. from those around you); to feel out of place;
5: to be frivolous; to be uncertain;
6: to have no basis; to be unreliable
Common word, Godan verb with ku ending, Intransitive verb 

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