行動こうどう Common Noun Irregular Intransitive Noun English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verbnouns which may take the genitive case particle 'no' action;conduct;behaviour;behavior;mobilization;mobilisation 彼は友人の行動に憤慨した。 He resented his friend's action.