水みず臭くさい

i-adjective

stand-offish; distant; reserved

Describes someone who is overly formal or not open with close friends or family, as if treating them like strangers. Often used in negative or admonishing contexts.

• 友とも達だちなのに水みず臭くさいよ。

  We're friends, so don't be so distant.

• 家か族ぞくにまで水みず臭くさい態たい度どを取とるのはやめなさい。

  Stop being so reserved even with your own family.

i-adjective

watery; weak (drink)

Used for drinks like alcohol or coffee that taste too diluted or lack strength.

• このコーヒーは水みず臭くさくて美味おいしくない。

  This coffee is watery and doesn't taste good.