inefficient

in|ef|fi|cient /'ɪnɪf'ɪʃənt/
[ADJ]
Inefficient people, organizations, systems, or machines do not use time, energy, or other resources in the best way.
Their communication systems are inefficient in the extreme.
efficient
inefficiency [N-VAR]
...the inefficiency of the distribution system.
inefficiently [ADV] ADV with v
Energy prices have been kept low, so energy is used inefficiently.

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