Refers to an emotional, often tender or nostalgic, state of mind. Can carry a slightly negative nuance of being overly emotional or maudlin.
His story was full of sentiment.
Let's stop indulging in sentimentality.
感傷 specifically means wistful or sentimental feeling (often tinged with sadness), while 情感 is broader, covering any deep emotional sensitivity.
sentimental drama
sentimentalist
sentimental; emotional; maudlin
sentimentalism
sentimentalist
Compound of 感 (かん, 'feeling') and 傷 (しょう, 'wound'), suggesting an emotion that touches or wounds the heart. The exact historical derivation is uncertain, but the kanji combination is conventionally associated with the meaning of sentimentality.