The phrase "any less appropriate than" is correct and usable in written English.
It can be used when comparing the appropriateness of two different things or actions.
Example: "Is this behavior any less appropriate than what we saw last week?"
Alternatives: "any more suitable than" or "any more fitting than".
I can't imagine any less appropriate custodial parent than Peter Cook".
But hair-splitting seems less appropriate than in other Dogme film, and this stands out as the most assured of an erratic bunch.
It would be hard to imagine anyone less appropriate than Alicia J. Graf to play the strung-out pop star in Ailey's "Flowers".
The songs I would write for one of my own records began to seem less appropriate than songs written in a broader style.
I'll leave it up to the parents whether a book called "The Dead Bird" is more appropriate or less appropriate than a book called "Ice Cream is Good".
When they learned that such exchanges occurred, they reported that it "altered their perception of the medical profession". Patients also feel that gifts are more influential and less appropriate than doctors do.
Ed Stockton: I think boxing is possibly the only sport less appropriate than cricket to hear Taylor Swift playing over the tannoy.
The notion of "incomplete symbol" seems less appropriate than "construction" in the case of propositional functions and propositions.
Two performance measures are considered for both problems: the root-mean-square recovery error (RMSE) is more widely used, but may be less appropriate than the mean absolute recovery error (MAE) in the presence of impulsive noise.
That assumption may be incorrect for [N-methyl-11C]mirtazapine because multiple components may have been identified by methods A and B (see Figure 3), making method F less appropriate than method E for estimating regional binding potentials in the living human brain.
