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Two will suffice. / Two will be plenty/enough.

Are there enough chairs to go around?

Will the beer run to one cup for each person?

My salary is inadequate to my needs.

not have enough time

run behind one's expenses

be unqualified

be below a standard; fall short of standard

be sufficient/adequate to feed five people

reach the age of retirement

be up to standard; reach a standard

This coat is not long enough.

She cried/wept her fill.

Enough (has been) said.

It's rather cold today.

It's good enough.

have had enough/plenty; have got one's fill

The ladder won't quite reach (as far as) the window.

I'm tired of having the same kind of food every day. / I've had my fill of having the same kind of food every day.