区く別べつがつかない

expression

can't tell apart; indistinguishable

Used when two or more things look or seem so similar that one cannot distinguish between them. Often implies a lack of clear difference.

See also: 区別がつく

• この双ふた子ごは本ほん当とうに区く別べつがつかない。

  I really can't tell these twins apart.

• 本ほん物ものと偽にせ物ものの区く別べつがつかないほど精せい巧こうだ。

  It's so elaborate that you can't tell the real thing from the fake.