Answer:
"Infernal" - from the 3 words given the closest in meaning : annoying.
Explanation:
All the words are adjectives, they modify / clarify nouns and pronouns.
Infernal: Formal english: something that belongs to the underworld of the dead, hellish or diabolic.
Informal english: something annoying or confounded. (extra annoying)
Annoying; irritating, perturbing, unwelcome, pester etc.
Fiery: A fire based object that burns strongly and brightly releasing a lot of heat. Synonyms could be flaming, blazing, ablaze, burning etc.
Unpleasant: something that causes annoyance, is disagreeable, irritable, etc
When making use of the word infernal it is used to emphasis the degree of annoyance beyond normal.
For example: I have a terrible headache caused by the infernal party noise at my neighbor´s house all night long.
Here the use of infernal goes beyond annoying (extra annoying)
Therefore, from the options provided the closest logical answer is annoying.
