Meaning of “inefficient” - Learner’s Dictionary

inefficient

adjective us uk /ˌɪnɪˈfɪʃənt/

Inefficient people or things waste time, money, or effort, and do not achieve as much as they should:

an inefficient heating system
inefficiently adverb
inefficiency noun [ C, U ] us uk /ˌɪnɪˈfɪʃənsi/

(Definition of “inefficient” from the Cambridge Learner’s Dictionary © Cambridge University Press)