"wanting in resources or energy and ability to shift for oneself," 1580s, from shift (n.1) in the sense "resources" + -less. Related: Shiftlessly; shiftlessness.
studied in a shiftless way
a shiftless student
shiatsu
shibboleth
shield
shift
shifter
shiftless
shifty
shih-tzu
Shiism
shiitake
Shiite
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