N2 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
大したものだ
taishitamonodathat's really somethingN2expression
Example sentences2
一人でここまで作るとは、大したものだ。
hitori de koko made tsukuru to wa, taishita mono da.
Making it this far alone really is something. neutral
独学で資格を取るなんて、大したものだね。
dokugaku de shikaku o toru nante, taishita mono da ne.
Getting qualified through self-study — that's really something. casual