1.
Someone or something that is ~ produces or does a lot for the amount of resources used.
Training makes workers highly ~...
...fertile and ~ soils.
ADJ
~ly
The company is certain to reinvest its profits ~ly.
ADV: ADV with v
2.
If you say that a relationship between people is ~, you mean that a lot of good or useful things happen as a result of it.
He was hopeful that the next round of talks would also be ~...
= fruitful
ADJ
~ly
They feel they are interacting ~ly with elderly patients.
ADV: ADV with v