Lucy was suffering from the most grievous wrong which this world has yet discovered: diplomatic advantage had been taken of her sincerity, of her craving for sympathy and love. Such a wrong is not easily forgotten. Never again did she expose herself without due consideration and precaution against rebuff. And such a wrong may react disastrously upon the soul.
E. M. ForsterThe test of a round character is whether it is capable of surprising in a convincing way. If it never surprises it is flat. Flat characters ... in their purest form ... are constructed round a single idea or quality; when there is more than one factor to them, we get the beginning of the curve toward the round. The really flat character can be experessed in one sentence such as, "I will never desert Mr Micawber." There is Mrs Micawber - she says she won't desert Mr Micawber; she doesn't, and there she is.
E. M. Forster