even if ...,...cannot

not ... at all

very, exceedingly, awfully / (before a negative form) not at all, at all, by no means

bright, light, luminous / merry, cheerful

bright, light, luminous / merry, cheerful

four sides, all sides

room (of a house or hotel), chamber, apartment, flat / (sumo) a stable where rikishi live and train together under a shisho oyakata (stable master)

(Internet slang, dated) Windows (an operating system)

window

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)