Ungrateful meaning

As a king he proved ungrateful to his mother, and weak as a ruler.

There she was joined by Louis whom she adopted as her successor instead of the ungrateful Alphonso.

A treasonable senate secretly plotting his dethronement, a mutinous diet rejecting the most necessary reforms for fear of "absolutism," ungrateful allies who profited exclusively by his victories - these were his inseparable companions during the remainder of his life.

Marie de' Medici had turned against her "ungrateful" minister with a hatred intensified, it is said, by unrequited passion.

So, do not be ungrateful, but sing His praises and thank Him for his goodness toward you.