Last year, I had the opportunity to visit Chania again with my family and I was speechless when I understood that everything had undergone rapid change due to tourism.

speechless 是由名词 speech（言语）加上后缀 -less（表示“没有”）构成的形容词，字面意思是“没有言语的”，引申为“惊讶得说不出话的”。