Focus on the positives. Perhaps there wasn't as much of a growth opportunity as you'd like, or you're more of a social person who thrives in a team environment and the position you held was mostly a solitary work environment. Distill it down to a matter of personal preference or advancing your career and less so, pointing out what they were doing wrong.

Everyone is different. The only reference point is how someone thinks is your own. People who expect others to think like them are more common than you'd think. So never think that the interviewer is the same as you, or will interpret your example in the same way you might. Therefore, it's crucial to remain objective. If you can, use situational examples that don't reflect negatively on the work environment. Avoid laying blame on former colleagues for what you liked least. Don't hold everyone you work with to unrealistic standards or expectations. Communicating such points will reflect more poorly on you than on them.

"I felt like the work environment just didn't foster the type of growth I was hoping for at this stage in my career. It wasn't quite setting the pace I'd prefer for advancement and innovation. There was just a little too much business as usual, day in and day out. So, I guess I just need something that is faster-paced where I feel like there is a mutually attainable goal towards growth."

"They have a successful business model. But I find they just play it a little too safe in a way that doesn't foster innovation in the way I hoped. As a result, there isn't much of an opportunity for innovation or new ideas."