This machine is inefficiency.
This machine is low efficiency.
Which one is correct, or what is the difference between them?
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Both are wrong. Correct is:
"This machine is inefficient".
"This machine is low efficient". Or: "This machine's efficiency is low"
"Inefficient" is worse than "low efficient".
If a machine is low efficient, it's efficient enough to have a benefit - even if it is not much.
If a machine is inefficient, it means that the costs are higher than the earnings.
Ok, "to be low efficient" may be strange, but in my defense, when you have to deal mainly with scientific and engineering stuff, it seems to be acceptable - where I must admit that my references are mainly Asian authors: