Nostalgic and SENTIMENTAL are both terms used to describe an emotional state. Nostalgic is defined as a longing for the past, while SENTIMENTAL is defined as having or displaying tender, romantic, or nostalgic feelings. Both terms are often used to describe a feeling of nostalgia or sentimentality for a time or place in the past. They can also be used to describe a person's emotional attachment to a particular object or memory.