expressive of or appealing to sentiment, especially the tender emotions and feelings, as love, pity, or nostalgia: a sentimental song.
pertaining to or dependent on sentiment: We kept the old photograph for purely sentimental reasons.
weakly emotional; mawkishly susceptible or tender: the sentimental Victorians.
characterized by or showing sentiment or refined feeling.

1740–50; sentiment + -al1

sentimentally, adverb
antisentimental, adjective
antisentimentally, adverb
hypersentimental, adjective
hypersentimentally, adverb
intersentimental, adjective
oversentimental, adjective
oversentimentally, adverb
quasi-sentimental, adjective
quasi-sentimentally, adverb
semisentimental, adjective
semisentimentally, adverb
supersentimental, adjective
supersentimentally, adverb
unsentimental, adjective
unsentimentally, adverb

1. romantic, tender, nostalgic; maudlin, bathetic.

1, 4. dispassionate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sentimental (ˌsɛntɪˈmɛntəl)
1.  tending to indulge the emotions excessively
2.  making a direct appeal to the emotions, esp to romantic feelings
3.  relating to or characterized by sentiment

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1749, "pertaining to or characterized by sentiment," from sentiment (q.v.). At first without pejorative connotations; meaning "having too much sentiment" had emerged by 1793 (sentimentalist).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These observations are filtered through a mind that is alert, never
  sentimental, and deeply suspicious of romantic cant.
For those on our cruise, it was clearly a sentimental journey.
People often use words to convey, not what the actual words mean, but a
  sentimental meaning.
Here, the scale is smaller, and there is no superabundance of monologue and
  sentimental digression.
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