Her refusal to sell the old house was purely based on sentimentality, not rational judgment.

sentimentality 是由形容词 sentimental（多愁善感的）加上名词后缀 -ity 构成的名词。sentimental 来自名词 sentiment（情感、情绪），加上形容词后缀 -al。sentimentality 指"过度感伤、感情用事"的状态或特质。