Choose the option which means the opposite of the given word:
Lackadaisical
a. Intelligent
b. Dull
c. Enthusiastic
d. Monthly

Hint: Here, we have to find the opposite of the given word. Try to understand the meaning of the given word. Now go through the options, recall what they mean and choose the one that means the opposite or is closest to meaning the opposite of the given word.

Complete answer: Antonyms are those words that express a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other.
In the given question, the word ‘lackadaisical’ refers to ‘lacking spirit or liveliness’.
Let us analyze the options given to us in this question:
Option (a.), 'Intelligent', refers to ‘having the capacity for thought and reason especially to a high degree’. Therefore, option (a.) is incorrect as its meaning is not antonymous to that of the given word ‘lackadaisical’.
Option (b.), ‘Dull', refers to ‘lacking in liveliness or animation’. Therefore, option (b.) is incorrect as its meaning is not antonymous to that of the given word ‘lackadaisical’.
Option (c.), ‘Enthusiastic', refers to ‘having or showing great excitement and interest’.
Therefore, option (c.) is correct as its meaning is antonymous to that of the given word ‘lackadaisical’.
Option (d.), ‘Monthly', refers to ‘of or occurring or payable every month’. Therefore, option (d.) is incorrect as its meaning is not antonymous to that of the given word ‘lackadaisical’.
therefore, option c. is the right answer.
Note: Sometimes the given options in a question where we have to find the opposite of the given word do not exactly mean the opposite of the given word. If this happens, we have to select the option which is the most antonymous to the meaning of the word in the question.