as they come

Adverb

idiomatic not-comparable

(idiomatic) as it is possible to be

Japanese Meaning

可能な限り、そのものとして存る状態（例：彼は頑固さにおいて例外的である＝究極の頑固さを示す） / ありのままの状態、実際に考えられる限りのあり方 / 例外的に極致を極めている、最高度である

He's as reliable as they come.

彼ほど頼りになる人はいない。

Sense（1）

(idiomatic) as it is possible to be

"Has he got a pulse?"

"With that hole in his head? You kiddin', a pulse? Give me a break, will ya? He's about as dead as they come.