Fact: Humans are anything but adaptive.
Then why are we the only species that inhabits every biome on Earth?
It's a relative concept. But I suspect you're looking at the term differently as well.
Adaptiveness stems from a need/desire to adapt. This is what allows us to live in the arctic circle, to cope with natural disasters, and to visit the moon.
But sometimes there isn't any real desire to adapt, and this is where humanity will seem like it's in a rut.
- When was last time you tried something for the first time?
ie, People who are in a rut tend not to be very experimental. I think humanity has become somewhat afraid of trying new things, because the last time we tried ended up with Stalin and a cold war.
- Are you comfortable living with unrealized goals?
ie, People who are in a rut tend not to be very ambitious.
- Have you made any big mistakes lately?
ie, People who are in a rut tend to stick with what they know best.