Final answer:
To add a suffix to the word 'memory' in the sentence, you can use the suffix '-less' to make it 'memory-less'.
Step-by-step explanation:
In this sentence, the word 'memory' is used as a noun. To add a suffix to it, you can use the suffix '-less', which means without. So, the sentence can be modified to say, 'The trip to the Giddy House was memory-less.'
Learn more about Suffixes in English