トムは礼儀知らずだ。

とむは礼儀知らずだ。

Tom has no manners.

トムは礼儀知(れいぎし)らずだ。

Tomu wa reigishirazu da.

富む (とむ)

to be rich; to become rich; to be abundant (with); to abound (with); to be rich (in)

は (は)

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

礼儀知らず (れいぎしらず)

rudeness; impoliteness; mannerlessness; snottiness

だ (だ)

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

Readings: レイ、ライ

Meanings: salute, bow, ceremony, thanks, remuneration

Reading: ギ

Meanings: ceremony, rule, affair, case, a matter

Readings: チ、し.る、し.らせる

Meanings: know, wisdom