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1.
A person or action that is slow, without purpose, lurking, mal-intented

or unemployed i.e with-out shifts
Damone was at his other baby's momma's house while his mother searched endlessly for him because he was suppose to pick her up at the airport like he had promised. Man he is so damned shiftless!
by Giaa January 05, 2006
 
2.
a style of writing that uses only lower-case letters.
e.e. cummings wrote many of his poems in the shiftless style, using no upper-case letters at all.
by samuel ross July 27, 2005