F3. Sometimes the to-infinitive gives a reason for the adjective:
a. disappointed, glad, sad, happy, anxious, pleased, surprised, proud, unhappy (e.g. We were happy to come to the end of our journey = We were happy because we had come to the end of our journey), and other adjectives with the "to-infinitive" are: able, unable, due, eager, keen, likely, unlikely, ready, prepared, unwilling, willing (e.g. Unfortunately I was unable to work for over a week.)
b. often use the "to-infinitive" with these adjectives after it to give opinions: difficult, easy, possible, impossible, hard, right, wrong, kind, nice, clever, silly, foolish (e.g. It’s easy to play the piano, but it’s very difficult to play well.)
more about the To + Infinitive
Idiom 365
Over My Dead Body: not allow something to happen
Example: Are my children going out to the dance party tonight? Over my dead body!