Clause + をいいことに

[Taking advantage of (negative nuance)]

Connection: Clause (plain form) + をいいことに / Noun + をいいことに

Usage: Indicates that someone takes advantage of a situation to do something inappropriate or undesirable. Always carries a negative or critical nuance — the speaker disapproves of the behavior.

Examples:

先生がいないのをいいことに、学生たちはサボっている。(Taking advantage of the teacher's absence, the students are slacking off.)

親が優しいのをいいことに、わがまま放題だ。(Taking advantage of their parents' kindness, they are completely spoiled.)

誰も見ていないのをいいことに、ゴミを不法投棄した。(Taking advantage of nobody watching, they illegally dumped trash.)