(Mi mo futa mo nai; “No filter”)
Too blunt; too open. Someone’s attitude or words being so blunt and tactless that they lack all nuance or subtlety; by extension, so blunt and tactless that further conversation becomes impossible. Literally “no body and no lid” – the “vessel” is entirely absent.
We have two nouns: 見 (mi), “body,” and 蓋 (futa), “lid.” Each is marked by the particle も (mo), “also” or “and.” They’re followed by ない (nai), the negative form of the “to be” verb, in sentence-final form.
Note that 器 (utsuwa), “vessel,” or “container,” can also metaphorically refer to someone’s level of ability, and that saying of someone that 器が小さい (utsuwa ga chiisai), “the vessel is small,” means they’re intolerant toward others’ foibles.
Mi can also be written as homophone 実 without any change in meaning.
See also 単刀直入.
(“Ano hito wa tsukareta toki, mi mo futa mo nai hanashikata ni naru zo. Tanomitai koto ga attara ashita ga ii kamo.”)
[“When they’re tired, they get really blunt. If you’re asking for something you should probably wait until tomorrow.”]