In the following questions,choose the word which is the exact $OPPOSITE$ of the given word:
$BENIGN$

Choose one of the following options that means the opposite of the given word:
Vivacious

Select the word or phrase which is closest to the $OPPOSITE$ in meaning of the highlighted word or phrase.
The chairman $initiated$ the proceedings with a brief speech.

Select the word or phrase which is closest to the $OPPOSITE$ in meaning of the highlighted word or phrase.
The atmosphere in that desolate place looked $ominous$.

Choose one of the following options that means the opposite of the given word:
Vitiate

In the following questions,choose the word which is the exact $OPPOSITE$ of the given word.
$TRANSPARENT$