low-grade

[loh-greyd]
adjective
of an inferior quality, worth, value, etc.: The mine yields low-grade silver ore.

Origin:
1875–80; low1 + grade

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
low-grade

adjective
of inferior quality 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Lowgrade is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences from the web
A small amount of plutonium would be present but will also be lowgrade.
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