(informal) "not knowing even a millimeter": completely ignorant in regards to something

(informal, chiefly in the negative) the slightest amount (in reference to one's knowledge, thought, etc.) / Used other than figuratively or idiomatically: see 一, ミリ.

milli-

Clipping of ミリメートル (mirimētoru, “millimeter”).

Clipping of ミリメートル (mirimētoru, “millimeter”).

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

to know, be aware of / to learn, acquire, / to be acquainted with, to know (someone) / (colloquial, in the negative) to care in the least about, to be concerned with,

(business) one on one meeting between an employee and a superior