A line is diagonal if it is not straight up and down relative to things around it, or not horizontal or vertical. Diagonal lines are at an angle.
Two things are different if they are not like each other, or can very easily be told apart. The purple flower in the picture is very different to all the red ones.
The opposite of different is similar.
Something is difficult if it is complicated and takes some skill to achieve.
The picture is of a difficult puzzle.
Something is dilated if it has become bigger or wider. The eye in the picture is dilated.
Dis forDisappointed
When you become a little sad because something doesn't work out the way you thought it would, you are disappointed.
Something is distant if it is a long way away from you. Something can be distant in terms of physical distance or time, for example "her childhood was a distant memory".











