事故は最も予期していないときに起こるものだ。

Accidents will happen when they are least expected.

事故(じこ)は最(もっと)も予期(よき)していないときに起(お)こるものだ。

Jiko wa mottomo yokishiteinai tokini okoru mono da.

事故 (じこ、ことゆえ)

accident; incident; trouble; circumstances; reasons

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

最も (もっとも、もとも)

most; extremely

予期 (よき)

expectation; assume will happen; forecast

時に (ときに)

by the way; incidentally; sometimes; occasionally

起こる (おこる)

to occur; to happen

者 (もの、もん)

person

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ジ、ズ、こと、つか.う、つか.える

Meanings: matter, thing, fact, business, reason, possibly

Readings: コ、ゆえ、ふる.い、もと

Meanings: happenstance, especially, intentionally, reason, cause, circumstances, the late, therefore, consequently

Readings: サイ、シュ、もっと.も、つま

Meanings: utmost, most, extreme

Readings: ヨ、シャ、あらかじ.め

Meanings: beforehand, previous, myself, I

Readings: キ、ゴ

Meanings: period, time, date, term

Readings: キ、お.きる、お.こる、お.こす、おこ.す、た.つ

Meanings: rouse, wake up, get up