What are the opposite words for efficient?

The antonyms for the word "efficient" are "inefficient" and "ineffectual." Ineffective indicates that something does not produce the desired or intended outcome, whereas inefficient denotes that something is not utilizing its resources or energy in the best possible manner. An ineffective system or process wastes time, effort, and resources without producing the desired results. Moreover, an inefficient method or product requires more energy or resources than it should, resulting in wasted time and money. Therefore, it is essential to employ efficient methods or products that deliver desired outcomes using the least amount of energy or resources, while avoiding ineffective or inefficient methods that waste vital resources.

Antonym of the day

most doordie
few, little.