The quality or state of being gimcrack; the characteristic of being cheap, showy, and of poor quality.
Formed from gimcrack with the suffix '-iness,' creating an abstract noun describing the quality or degree of cheapness and showiness, following standard English patterns (like 'happiness' from 'happy').
Notice how English lets us layer suffixes—gimcrack becomes gimcrackery becomes gimcrackiness—each layer adding different nuances: the thing, the practice, and the quality. Other languages can't do this as easily, making English uncommonly good at expressing subtle judgments about quality.
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