grey; gray (having a color somewhere between white and black, as the ash of an ember) / ambiguous

grey; gray (color) / ambiguity / gray (SI unit of absorbed radiation)

(literally) a red lotus bloom / crimson

a surname

to become lost, to lose one's way

Earl Grey

group of juvenile delinquents that have connection with yakuza; hoodlum

aiglet

(anglicism) regret (remorse) / (decision theory) regret

foolish and base