Etymology
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unfruitful (adj.)

late 14c., "barren," from un- (1) "not" + fruitful. Originally literal; figurative sense is attested from c. 1400. Related: Unfruitfully; unfruitfulness.

updated on May 22, 2012

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Definitions of unfruitful from WordNet

unfruitful (adj.)
not fruitful; not conducive to abundant production;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.