Sentence examples for not rigourous enough from inspiring English sources

Alexey Bersenev, for example, points out on his stem cell blog that while the fact that MUSE cells express many pluripotency markers, similar to embryonic stem cells, marker expression alone is not rigourous enough of a test of pluripotency.

Not enough, not enough.

"Not enough, not soon enough," it said.

Not tough enough.

Not loud enough.

"Not smart enough.

Not often enough.

Not ugly enough,apparently.

Not confusing enough?

But not weak enough.

"Just not quick enough".