sad
affected with or expressive of grief or unhappiness

see another keyword links:
grief

unhappy

sad, sorrowful
sadness, sorrow

tragedy

sad, wretched, miserable
tragic, sorrowful, desolate

sad and beautiful
touching and beautiful

sad, miserable, wretched
grieved, sorrowful, afflicted

sad, sorrowful
having opinions but cannot speak

sad, sorrowful

worried, anxious, uneasy
sad, grieved

haggard, worn-out
worried, sad, distressed

indignant, sad
sigh emotionally

quiet, lonely, desolate
grievous, sad, sorrowful

heartbroken
broken-hearted

heartbroken
extremely sad
broken-hearted
break one's heart
overwhelmed by grief

touching
moving
producing strong emotion,
especially sadness or sympathy

passionate
emotional
sentimental
prompted by feelings of
tenderness, sadness, or nostalgia

lonely
lonesome
sad because one has no friends or company

I miss you