(obsolete) one day, 24 hours / (obsolete) the daytime, the period from dawn until dusk

(rare, obsolete) (all senses appear to be identical as for hitohi above)

(literary) one day, 24 hours / (literary) the daytime, the period from dawn until dusk / (literary) (figuratively) a short period of time

work; labor / achievement; ability; performance; talent / salary; earnings; income

中々: very, quite, considerably, rather, by no means (with negative verb)

very, quite, considerably, rather / by no means (with negative verb)

inside

the Second Sino-Japanese War

be tired out, be exhausted

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.