Jul 17, 2019 - 11:40 PM
What may be a deal-breaker for you may not be for someone else, which is why it's important to consider if the offer will make you so unhappy that you'll want to leave in six months. In that case, it wouldn't be fair to you – or the employer – to accept the position. If you do decide to decline the offer, it's important that you do it correctly or you could damage your professional reputation (hiring managers do talk to other hiring managers).
Make sure you express your appreciation for the time and effort the employer put into the recruitment and interviewing process. You don't have to provide a detailed reason why you are declining the offer, but you can say something like, "I've decided to accept a position at another company that is a better fit for my career plans."