different between shiftless vs shiftlessness

English

shift +? -less

shiftless (comparative more shiftless, superlative most shiftless)

Lazy, unmotivated.
- 2015, Philip E. Tetlock and Dan Gardner, Superforecasting: The Art and Science of Prediction:
  Decades ago, before credit scores, loan officers could make decisions almost whimsically and your fate could hinge on whether you reminded them of someone, or they had slept poorly the night before, or they harbored stereotypes of "shiftless blacks" and "flighty women."
Untrustworthy as a result of being incompetent at the job.
Destitute of shifts or expedients; lacking proper means.

From shiftless +? -ness

shiftlessness (usually uncountable, plural shiftlessnesses)

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