Something that is uncontrolled is said to be running rampant.

When we are undercover or hidden is said to be under disguise.

To stick closely to something is to cling to it.

Something that declines in value and function is said to degenerate.

A serving plate is often called a dish.

To express joy and pleasure for a special person is to congratulate them. 

Someone who appears very shy or modest is also called coy. 

An unpredictable event is sometimes referred to as an act of chance.

A generalized term for one insect is often called a bug.

Sometimes when we have a certain opinion of something which cannot change we are said to be bias of something.