彼は性質が頑固だ。

彼は性質が頑固だ。

He is obstinate in disposition.

彼(かれ)は性質(せいしつ)が頑固(がんこ)だ。

Kare wa seishitsu ga ganko da.

彼 (かれ)

he; him; his; boyfriend

は (は)

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

性質 (せいしつ)

nature; property; disposition

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

頑固 (がんこ)

stubbornness; obstinacy

だ (だ)

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

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: セイ、ショウ、さが

Meanings: sex, gender, nature

Readings: シツ、シチ、チ、たち、ただ.す、もと、わりふ

Meanings: substance, quality, matter, temperament

Readings: ガン、かたく

Meanings: stubborn, foolish, firmly

Readings: コ、かた.める、かた.まる、かた.まり、かた.い

Meanings: harden, set, clot, curdle