Everybody, all people

open a door etc. / open, allow freedom of entry and exit / be open and frank

openness, not being closed / openness, allowing free entry and exit / openness, frankness

park

suitable for everyone and their mother

Alternative form of 万人向け (bannin-muke)

(followed by a negative) even if, never / (followed by a negative) no matter what

many / all

ten thousand / a large number / all, everything

ten thousand / myriad / a great number of