Understanding the Word INDUBITABLE

The question asks us to find the word that is MOST SIMILAR in meaning to the given word, INDUBITABLE.

Let's first understand the meaning of INDUBITABLE.

INDUBITABLE is an adjective that describes something that is impossible to doubt; unquestionable.

Now, let's look at the provided options and their meanings:

• Suspicious: Causing feelings of suspicion or distrust; doubtful.
• Savory: (of food) tasting of salt, not sweet; pleasant, agreeable, or respectable.
• Unquestionable: Not able to be disputed or doubted; certain.
• Impugn: Dispute the truth, validity, or honesty of (a statement or motive); call into question.
• Relevant: Connected with or appropriate to what is happening or being considered.

We are looking for the word most similar in meaning to INDUBITABLE, which means unquestionable or impossible to doubt.

• "Suspicious" means doubtful, which is the opposite of indubitable.
• "Savory" relates to taste or pleasantness, which is unrelated to indubitable.
• "Unquestionable" means not able to be doubted, which is exactly the meaning of indubitable.
• "Impugn" means to call into question or dispute, which is related to doubting but is a verb describing the act, and it implies questioning something that might be doubtful, not that something is indubitable.
• "Relevant" means connected or appropriate, which is unrelated to indubitable.

Comparing the meanings, "Unquestionable" is the word that shares the most similar meaning with "INDUBITABLE". Both words describe something that cannot be doubted or is certain.

Therefore, the word most similar in meaning to INDUBITABLE is Unquestionable.