The problem is too difficult to solve.
The box is too heavy to carry.
The baby is too little to walk.
He is too weak to lift this weight.
She is too busy to talk with you.
She was too inattentive to notice the mistake.
The rule was too difficult for them to understand.
He was too stupid to see the joke.
She is too fat to wear this dress now.
The accident was too terrible to talk about.
They were too empty-headed to learn.
The window was too dirty to see through.
She was too foolish to understand my explanation.
I have too little wool to make a sweater.