: a foolish or stupid quality : a fatuous quality

: something foolish or stupid : a fatuous remark

-Merrium Webster Dictionary

Looked at in one way each breadth stands alone, the bloated curves and flourishes – a kind of ” debased Romanesque” with delirium tremens – go waddling up and down in isolated columns of fatuity.

This word serves to describe how foolish and unrealistic the designs seemed to her.