Meanings of so unimaginative in English

How could people have been so unimaginative, so slavish, as to make the same technology for so long?

This is a man so unimaginative that he can ride unflustered into the worst place in the world.

That was the worst of Jay, she was so literal, so unimaginative, so lacking in the simple unpractical quality of poetry.

They are so nice, so gentlemanly, so easy to get on with; and yet, in another region, they are so dull, so unimaginative, so narrow-minded.

So far, so unimaginative, but the line judge grassed to the umpire anyway, the umpire grassed to more senior officials, and she was duly disqualified.