"- Well ! she murmured. Curiouser and curiouser.
- What ? Quentin said.
- It's from Alice in Wonderland, said Lisa. Alice sais that when she sees the rocking-horse-fly. It's another use of the « -er » suffice your Mum was talking about. To make a comparison. Big, bigger. Curious, curiouser, except that it's not correct English. You should says « more and more curious ». Curious is like strange. Come on, let's go home.
Quentin la suivit sans se faire prier. En effet, cette journée étrange se terminait sur une bien curieuse rencontre."