Algeria needs a decently powerful economy.

We had a decently good season.

Our team had a decently good season.

Algeria needs to become a decently powerful economy.

Yanni was a decently good singer.

Through the clear wintry sunshine the bells this morning rang from the gray church tower amid the leafless elms, and up the walk the villagers trooped in their best dresses and their best faces — the latter a little reddened by the sharp wind: mere redness in the middle aged; in the maids, wonderful bloom to the eyes of their lovers — and took their places decently in the ancient pews.

Behave decently, as if you're a well-cultured man.