辛酸 (xīn suān): เผ็ด (รสชาติ)

He lost his parents as a child and relied on collecting scraps to survive. Speaking of that bitter childhood, he couldn't hold back his tears.

In order to support her younger brother's schooling, she worked two jobs every day. Those bitter days lasted a full five years.

After his business failed, he fell into deep debt. That bitter experience made him stronger.

Old Zhang worked hard his whole life, yet couldn't even afford an apartment. Only he knew the bitterness in his heart.