conceal
The opposite for the word "polish" could be "tarnish" or "dull" depending on the context.
Depending on context, either height or shallowness is the opposite of depth.
indirect, usually, depending on the context.
'Infamous' or 'unknown', according to context.
a word that's the opposite of the unfamiliar word.
There is no specific or definitive single word. It would depend on context. Me, them, her, him are some examples.
Either "biased" or "colorful" depending on the context of "neutral".
Depending on context, antonyms for exuberant could be gloomy, restrained and meager.
Something sacred is set apart for some religious purpose. Secular is the opposite of sacred but a true antonym for this word depends on the context.
I am assuming that you mean opposite and not opposide, which is a word that is not found in the English language.The answer depends on the context for defining opposite: whether you mean additive opposite or multiplicative opposite or an opposite defined under some other criterion.
The opposite of under could be over or above.
in the context of computers only: uninstallation all other contexts: removal