inefficient
adjective
uk/ˌɪnɪˈfɪʃənt/ ususing resources such as time, materials, or labour in a way that wastes them:
There are too many big, inefficient companies in almost every part of the economy.
extremely/highly/increasingly inefficient
Compare
efficient
inefficiently
adverb /ˌɪnɪˈfɪʃəntli/
Governments spend money inefficiently and get little return for it.