sad adj.
1 unhappy
VERBS appear, be, feel, look, seem, sound | become, grow | make sb This music always makes me sad.
ADV. all, desperately, immensely, particularly, profoundly, really, unbearably, very I called Mum, sounding all sad and pathetic. | almost | a bit, a little, quite, rather, slightly, somewhat | strangely
PREP. about She was still feeling very sad about her father's death.
2 causing unhappiness
VERBS be, seem | find sth
ADV. deeply, extremely, intensely, particularly, profoundly, really, terribly, unutterably, very a deeply sad occasion | a bit, a little, quite, rather a rather sad story
You can also check other dicts: sad (English, 中文解释 ), wordnet sense, Collins Definition