彼の主張には根拠がないことに注意することが重要である。

Sentence Analyzer

主張 根拠 ない こと 注意する こと 重要 ある

English Translation

It is important to note that his assertion is groundless.

Furigana

(かれ)主張(しゅちょう)には根拠(こんきょ)がないことに注意(ちゅうい)することが重要(じゅうよう)である。

Romanji

Kare no shuchō ni wa konkyo ga nai koto ni chūisuru koto ga jūyō de aru.

Words

(かれ)
he; him; his; boyfriend
()
indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
主張 (しゅちょう)
claim; request; insistence; assertion; advocacy; emphasis; contention; opinion; tenet
()
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
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
根拠 (こんきょ)
basis; foundation
()
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
無い (ない)
nonexistent; not being (there); unpossessed; unowned; not had; unique; indicates negation, inexperience, unnecessariness or impossibility; not ...; to not be...; to have not ...
(こと、こん)
thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as
注意 (ちゅうい)
caution; being careful; attention (heed); warning; advice
重要 (じゅうよう)
important; momentous; essential; principal; major
()
be; is; indicates past or completed action; indicates light imperative
(ある)
a certain ...; some ...

Kanji

Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Readings: シュ、 ス、 シュウ、 ぬし、 おも、 あるじ
Meanings: lord, chief, master, main thing, principal
Readings: チョウ、 は.る、 -は.り、 -ば.り
Meanings: lengthen, counter for bows & stringed instruments, stretch, spread, put up (tent)
Readings: コン、 ね、 -ね
Meanings: root, radical, head (pimple)
Readings: キョ、 コ、 よ.る
Meanings: foothold, based on, follow, therefore
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: ジュウ、 チョウ、 え、 おも.い、 おも.り、 おも.なう、 かさ.ねる、 かさ.なる、 おも
Meanings: heavy, heap up, pile up, nest of boxes, -fold
Readings: ヨウ、 い.る、 かなめ
Meanings: need, main point, essence, pivot, key to