sadness

As an adjective heartbroken

is suffering from sorrow, especially after a failed romance.

As a noun sadness is

(uncountable) the state or emotion of being sad.

As a noun sadness

is (uncountable) the state or emotion of being sad.

As an adjective regretful is

full of feelings of regret, indulging in regrets.

As nouns the difference between responsibility and sadness

is that responsibility is the state of being responsible, accountable, or answerable while sadness is the state or emotion of being sad.

As nouns the difference between sadness and heartbreak

is that sadness is the state or emotion of being sad while heartbreak is overwhelming mental anguish or grief, especially that caused by loss or disappointment.

As nouns the difference between grieving and sadness

is that grieving is an act or instance of grieving while sadness is the state or emotion of being sad.

As a verb grieving

is present participle of lang=en.

As a verb cars

is to break.

As a noun sadness is

(uncountable) the state or emotion of being sad.

In uncountable terms the difference between sadness and fear

is that sadness is the state or emotion of being sad while fear is extreme veneration or awe, as toward a supreme being or deity.

In countable terms the difference between sadness and fear

is that sadness is an event in one's life that causes sadness while fear is a phobia, a sense of fear induced by something or someone.

As a verb fear is

to cause fear to; to frighten.

As an adjective fear is

able; capable; stout; strong; sound.

As nouns the difference between anxiety and sadness

is that anxiety is an unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about some uncertain event while sadness is (uncountable) the state or emotion of being sad.

Adversity is a related term of sadness.

In uncountable|lang=en terms the difference between adversity and sadness

is that adversity is (uncountable) the state of adverse conditions; state of misfortune or calamity while sadness is (uncountable) the state or emotion of being sad.

In countable|lang=en terms the difference between adversity and sadness

is that adversity is (countable) an event that is adverse; calamity while sadness is (countable) an event in one's life that causes sadness.

As nouns the difference between adversity and sadness

is that adversity is (uncountable) the state of adverse conditions; state of misfortune or calamity while sadness is (uncountable) the state or emotion of being sad.