彼は数学が全くだめだ。

彼は数学が全くだめだ。

He is terrible at math.

彼(かれ)は数学(すうがく)が全(まった)くだめだ。

Kare wa sūgaku ga mattaku dame da.

彼 (かれ)

he; him; his; boyfriend

は (は)

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

数学 (すうがく)

mathematics; arithmetic

が (が)

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

全く (まったく)

really; truly; entirely; completely; wholly; perfectly; indeed; good grief (expression of exasperation)

駄目 (だめ、ダメ)

no good; not serving its purpose; useless; broken; hopeless; wasted; in vain; purposeless; cannot; must not; not allowed

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: スウ、ス、サク、ソク、シュ、かず、かぞ.える、しばしば、せ.める、わずらわ.しい

Meanings: number, strength, fate, law, figures

Readings: ガク、まな.ぶ

Meanings: study, learning, science

Readings: ゼン、まった.く、すべ.て

Meanings: whole, entire, all, complete, fulfill