Efficient and Self-sustained

Efficient adjective - Producing or capable of producing a desired result.

Self-sustained and efficient are semantically related In some cases you can use "Self-sustained" instead an adjective "Efficient".

Nearby Words: efficiency, efficiently, efficacy

Self-sustained adjective - Able to take care of oneself or itself without outside help.

Efficient and self-sustained are semantically related in able to take care of oneself topic. You can use "Efficient" instead an adjective phrase "Self-sustained".