にかこつけて
Using X as a pretext or excuse to do (or avoid) something, where X is not the real reason. It usually carries a critical or ironic tone toward the person's motives.
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Used in both speech and writing to describe someone exploiting a circumstance, such as illness, work or an errand, as cover for what they really want. It typically describes others' behavior with mild disapproval or irony, though it can be used self-deprecatingly. Unlike をきっかけに or を機に, which neutrally mark a starting point, にかこつけて implies the stated reason is a cover story.
Do not use にかこつけて for a genuine, sincere reason; it implies the stated reason is only an excuse.
Note that the pattern often sounds critical, so using it about someone's actions can imply you doubt their honesty.
Learners should remember that X is the excuse and the following clause is what the person actually does or avoids.
- 1.をいいことにN1「をいいことに」 does not treat the preceding item as an excuse; instead, it means taking advantage of a situation favorable to oneself (e.g., no one is watching, the other person is weak). Both patterns carry criticism, but they are not interchangeable. It can also attach to verbs and adjectives as 「のをいいことに」, not just nouns.
- 2.をきっかけにN2With 「をきっかけに」, the preceding item is a genuine trigger that sparks a change or new action, with a neutral tone. With 「にかこつけて」, it is only a pretext, not the real motive, often with criticism or mockery. The two cannot be swapped.
- 3.を機にN1With 「を機に」, the preceding item is a real turning point, and what follows is a new action or change that begins from it; the pattern is written-style and not derogatory. 「にかこつけて」's preceding item is merely an excuse, often critical. The two cannot be swapped.
- 4.ためにN4With 「ために」, the preceding item is a true purpose or reason, with a neutral tone, while 「にかこつけて」 uses it only as an excuse with a critical nuance. 「ために」 can attach to verbs, adjectives, or 「noun + の」, and the two are not interchangeable.
- 5.ものだからN2「ものだから」 states a real reason, usually to excuse oneself, and is colloquial; 「にかこつけて」's preceding item is just a pretext, typically used to criticize others. 「ものだから」 attaches to plain forms of all types, with nouns taking 「な」. The two cannot be swapped.
をいいことに means taking advantage of a favorable situation someone happens to be in, while にかこつけて means presenting X as a false excuse for what one really wants. をきっかけに and を機に neutrally mark a trigger or turning point, and ために simply states a purpose or cause. ものだから gives a reason, often a self-justifying one that may itself be an excuse, but its form does not mark that reason as a cover for a different real motive the way にかこつけて does.
