Was heißt »zweckdienlich« auf Englisch?

Das Adjektiv »zweckdienlich« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

Make yourselves useful.
This dictionary is very useful.
This dictionary isn't useful at all.
Roses are indeed useful flowers, especially when they consist of marzipan.
Tom is a useful idiot.
Do you think that it isn't useful for me to contribute English sentences with the same meanings and that I should stop doing this?
On this site, there are many useful articles.
He always does only what is most convenient for him.
"That internet project is a waste of time. Stop it and do something useful." "No way! I enjoy it and it helps both myself and others. So I find it very useful."
One day even this sentence might be useful to someone.
Our house is in a convenient location.
The teacher handed out some useful learning materials to the pupils.
The teacher was handing out some useful learning materials to the pupils.
These objects are very useful.
Computers are very useful.
Consequently, people prefer not to live in the centre because it's simply not convenient.
This software is not useful; delete it.
Thanks for that useful tip!
I didn't have anything else to do so I thought I'd make myself useful.
In the depths of humanity's collective unconscious, the troglodytes' way of thinking must be found. Toki Pona is a useful tool to bring this to the surface of our consciousness.