Antonyms

Precious means of great value, highly valued, or important. Worthless means having no value, useless, or unimportant. These are direct opposites in terms of value and importance.

Obvious means easily understood, evident, or clear to see. Obscure means not discovered or known about, uncertain, or unclear. These are direct opposites in terms of clarity and visibility.

Outset means the beginning or start of something. End means the final part, conclusion, or termination. These are direct opposites in terms of position in a sequence or timeline.

Divulge means reveal. Its opposite is keep secret.

Adulteration is making impure by adding inferior elements. Purification is its opposite, the removal of impure elements.

Deposition is the process of (any material) depositing itself (on a surface for example). A process of eroding is a gradual wearing away by abrasion, the opposite of deposition.

Boycott means shun or avoid, patronize means to visit regularly.

A fallacy is mistake in reasoning, a valid argument is its opposite.

Enervate means weaken. Strengthen is its opposite.

Loquacious means fond of talking, taciturn means not liking to speak. So, they are opposites.

Veneration means high regard and respect, derision means scorn and contempt, its opposite.

Repine means regret, express joy is its opposite.

Inveterate means habitual chronic. The most nearly opposite word is casual which means occasional or by chance, its opposite.

Amalgamate means to combine into a unified or integrated whole, or unite; separate is its opposite.

Undermine means to weaken the base or foundation; undergird is to support or strengthen from beneath.