Choose the option which means the opposite of the given word:

Lackadaisical

a. Intelligent
b. Dull
c. Enthusiastic
d. Monthly

Hint: The word ‘lackadaisical’ refers to ‘lacking enthusiasm and determination; carelessly lazy'. It is usually used as an adjective.

Complete answer:

The word ‘lackadaisical’ can be used in a sentence as follows:
For example, in the sentence ‘She had a very lackadaisical attitude’, the word ‘lackadaisical’ refers to laziness in the subject’s attitude.
Now, we know the meaning and usage of the given word. Let’s look at our options:

a. intelligent - The word ‘intelligent’ refers to ‘having or showing intelligence'. This has a completely different meaning to the given word. It is not the required antonym. So, this is an incorrect option.
b. dull - The word ‘dull’ refers to ‘lacking interest or excitement'. This has a similar meaning to the given word. It is not the required antonym. So, this is an incorrect option.
c. enthusiastic - The word ‘enthusiastic’ refers ‘having or showing intense and eager enjoyment, interest, or approval'. This word has the exact opposite meaning of the given word. It is the required antonym. So, this is the correct option.
d. monthly - The word ‘monthly’ refers to ‘happening, done, or made every month'. This has an unrelated meaning to the given word. It is not the required antonym. So, this is an incorrect option.

Note: With the context of the given sentence, try to understand the meaning of the given word as accurately as you can. Choose the best fitting option that has the exact opposite meaning of the given word.