The awkwardness between them during their first date was noticeable.

awkwardness 是由形容词 awkward（尴尬的、笨拙的）加上名词后缀 -ness 构成的名词，表示"尴尬的状态或感觉"。后缀 -ness 通常用于将形容词转化为名词，表示某种性质或状态。