Question

Choose the word that gives the antonym of the word italicized.
The sudden appearance of the stranger in the cottage despite all doors being closed is questionable.

a) casual
b) surprising
c) dubious
d) certain

Answer 1

Hint: Words that reverse the meaning of the word in question are referred to as antonyms. They are often referred to as opposites or those that are similar to the opposite of the word. Questionable is defined by anything that is doubtful, uncertain, or even disputable. It can refer to anything to which one can raise a question, such as a debatable point.

Complete answer:

Now, considering the above options,
Casual: Refers to something that is offhand, indefinite, or careless. Hence, it is not the answer. Eg: His casual attitude towards his future may cost him a lot. His family is deeply concerned about his behavior.
Surprising: Is anything that is unexpected and causes one to wonder as to how it occurred. Since it has no relation to the antonym of questionable, this word can be left out. Eg: It is indeed surprising to see the behavior of people towards their colleagues.
Dubious: This word is synonymous to questionable, often referring to uncertain conclusions or something that is doubtful.
Certain: This refers to the lack of even a speck of doubt and is fixed. Eg: She is certain that she will receive a call letter from the company.
Hence, Option d, Certain, is the answer to the question.

Note: “Dubious” is a synonym to the word “questionable”, while “certain” is the opposite in meaning, referring to that which is undoubtable. Casual refers to that which is indefinite and doesn’t correlate with the antonym asked for “questionable”.