Taxation according to income is the most effective instrument yet devised to obtain just contribution from those best able to bear it and to avoid placing onerous burdens upon the mass of our people.

It's very onerous.

The Food and Drug Administration required an onerous approval process to bring any test to market.

The cost of repairing this damage will be onerous.

By the way, your instructions to me never to allow Sir Henry to go out alone will become very much more onerous if a love-affair were to be added to our other difficulties.