unnamable
adj. 无法说出其名称的;难以说明的,难以形容的
例句
If you often feel a kind of unnamable touch in your heart.
假如你经常会有一种莫名的心动。
But sometimes it is invaded by unnamable sorrows and filled with plaint of life.
而有时心中便会有一种莫名伤感的情绪,对人生充满了感叹。
Whatever the shrimp, crab, shellfish or other unnamable seafood, all make our mouth water.
无论是虾,蟹,贝类亦或是其他不知名海鲜,都让人垂涎欲滴。