different between faddish vs irresponsible

English

fad +? -ish

faddish (comparative more faddish, superlative most faddish)

From ir- +? responsible.

irresponsible (comparative more irresponsible, superlative most irresponsible)

(now rare) Not responsible; exempt from legal responsibility, not to be held accountable.
- 1790, Edmund Burke, Reflections on the Revolution in France, Oxford 2009, p. 28:
  They left the crown what, in the eye and estimation of law, it had ever been, perfectly irresponsible.
Lacking a sense of responsibility; performed or acting as though without responsibility; negligent.

irresponsible (plural irresponsibles)

irresponsible in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
irresponsible in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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