Sentimental; prone to feeling strong sadness or nostalgia and often excessively emotional.
あの映画は感傷的で涙が止まらなかった。
That film was so sentimental I couldn't stop crying.
感傷的にならずに、事実を冷静に伝えよう。
Instead of getting sentimental, let's convey the facts calmly.
彼は昔話を聞くとすぐ感傷的になる。
He becomes sentimental as soon as he hears stories about the past.