彼は確かに最善を尽くしたが、注意が足りなかった。

Sentence Analyzer

確か 最善 尽くした 注意 足りなかった

English Translation

It is true that he did his best, but he was not careful enough.

Furigana

(かれ)(たし)かに最善(さいぜん)()くしたが、注意(ちゅうい)()りなかった。

Romanji

Kare wa tashika ni saizen o tsukushita ga, chūi ga tarinakatta.

Words

(かれ)
he; him; his; boyfriend
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
確か (たしか)
sure; certain; positive; definite; reliable; trustworthy; safe; sound; firm; accurate; correct; exact; If I'm not mistaken; If I remember correctly; If I remember rightly
()
at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although
最善 (さいぜん)
the very best
()
indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
尽くす (つくす)
to exhaust; to run out; to devote; to serve (a person); to befriend; to do to exhaustion
()
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
注意 (ちゅうい)
caution; being careful; attention (heed); warning; advice
足りる (たりる)
to be sufficient; to be enough; to be worth doing; to be worthy; to be sufficient; to answer; to do

Kanji

Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Readings: カク、 コウ、 たし.か、 たし.かめる
Meanings: assurance, firm, tight, hard, solid, confirm, clear, evident
Readings: サイ、 シュ、 もっと.も、 つま
Meanings: utmost, most, extreme
Readings: ゼン、 よ.い、 い.い、 よ.く、 よし.とする
Meanings: virtuous, good, goodness
Readings: ジン、 サン、 つ.くす、 -つ.くす、 -づ.くし、 -つ.く、 -づ.く、 -ず.く、 つ.きる、 つ.かす、 さかづき、 ことごと.く、 つか、 つき
Meanings: exhaust, use up, run out of, deplete, befriend, serve
Readings: チュウ、 そそ.ぐ、 さ.す、 つ.ぐ
Meanings: pour, irrigate, shed (tears), flow into, concentrate on, notes, comment, annotate
Reading: 
Meanings: idea, mind, heart, taste, thought, desire, care, liking
Readings: ソク、 あし、 た.りる、 た.る、 た.す
Meanings: leg, foot, be sufficient, counter for pairs of footwear