[na-adj] + にもほどがある
The expression にもほどがある literally means "there is a limit even to ~" and is used to express strong criticism or exasperation that something has gone too far or is beyond acceptable bounds. It conveys the speaker's feeling that a certain behavior, quality, or situation is excessive to the point of being unreasonable.
Attach にもほどがある to nouns (often abstract qualities or behaviors) to express that something is unacceptably extreme.
When used with verbs or adjectives, the dictionary form or い-adjective plain form precedes にもほどがある. With な-adjectives, the stem is used directly (without な).
This grammar pattern always carries a negative, critical, or exasperated tone. The speaker is expressing that the degree of something – whether rudeness, laziness, carelessness, or even kindness – has crossed an acceptable line. It is used when scolding someone or venting frustration.
Even when the quality itself is positive (like kindness), にもほどがある frames it as excessive and problematic.
This pattern frequently appears with words like しつれい失礼 (rude), むせきにん無責任 (irresponsible), わがまま (selfish), じょうだん冗談 (joke), ばか馬鹿 (stupid/foolish), and いいかげんいい加減 (irresponsible/half-hearted).