different between gaddishness vs faddishness

English

gaddish +? -ness

gaddishness (uncountable)

(nonce word) Quality of being gaddish.
- 1693-1694, Robert Leighton, A Practical Commentary on the First Epistle of St. Peter
  Elders, be such in grave and pious carriage, whatsoever be your years; for young men may be so, and, possibly, gray hairs may have nothing under them but gaddishness and folly many years old, habituated and inveterate ungodliness!

faddish +? -ness

faddishness (uncountable)

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