In the following question, out of the four alternatives, select the word similar in meaning to the word given. Ebullient.

Introduction / Context:
This vocabulary question asks for a synonym of the word ebullient. Such questions are common in general English sections and test your range of descriptive adjectives. Ebullient is often used to describe people, moods, or styles that are full of energy and lively enthusiasm.

Given Data / Assumptions:

• Target word: Ebullient.
• Options: Deceitful, Insincerity, Enthusiastic, Prejudice.
• You must pick the option closest in meaning to ebullient in standard English usage.

Concept / Approach:
The word ebullient comes from a root meaning to bubble or boil. Figuratively, it describes someone who is bubbling with energy and excitement. Therefore, we look for a positive adjective that expresses high spirits and liveliness. Among the options, enthusiastic clearly matches that sense, while the others refer to dishonesty or biased attitudes and are negative or unrelated in meaning.

Step-by-Step Solution:
Step 1: Recall the meaning of ebullient: full of cheerful energy, lively, and excited.Step 2: Examine each option. Deceitful means dishonest or misleading. Insincerity refers to lack of genuine feeling. Enthusiastic means full of eager interest or excitement. Prejudice refers to an unfair opinion formed without proper knowledge.Step 3: Match enthusiastic with the idea of bubbling energy and excitement.Step 4: Confirm that the other choices do not have any connection with joy or liveliness.Step 5: Therefore, choose Enthusiastic as the synonym.

Verification / Alternative check:
Use the words in sample sentences. An ebullient crowd cheered the team on and An enthusiastic crowd cheered the team on are very similar in meaning. By contrast, a deceitful crowd or a prejudice crowd would sound wrong and would change the meaning completely. This confirms that enthusiastic is the correct partner for ebullient in this context.

Why Other Options Are Wrong:
Deceitful: This describes a person who lies or cheats. It has no relation to high spirits or excitement.
Insincerity: This is a noun meaning lack of genuine feeling or honesty in emotion. It not only differs in meaning but also in grammatical form, since ebullient is an adjective.
Prejudice: This refers to an unfair and usually negative opinion formed without justification. It is a negative social attitude and is unrelated to the joyful nature implied by ebullient.

Common Pitfalls:
Sometimes learners confuse unusual words like ebullient with negative ones because they sound complicated. Another pitfall is not noticing the part of speech. Here, ebullient is an adjective, so the answer should also ideally be an adjective, which eliminates a noun like insincerity. Always think of example sentences where you might use the word and see which option can replace it without changing the tone or meaning.

Final Answer:
The word similar in meaning to ebullient is Enthusiastic.