Finding the Best Substitute for "Incapable of Being Tired"

The question asks us to find a single word that best replaces the phrase "Incapable of being tired". This is a common type of vocabulary question known as a one-word substitute.

Let's examine the meaning of each option provided to determine which one accurately fits the description "Incapable of being tired".

Analyzing the Word Options

• indefatigable: This word is formed from 'in-' (not) and 'defatigable' (capable of being tired). Therefore, 'indefatigable' means incapable of being tired or exhausting. Someone who is indefatigable can continue to work or strive for a very long time without becoming tired.
• inalienable: This word describes something that cannot be taken away from or given away by the owner or possessor. Rights, for example, are often described as inalienable. This meaning is not related to tiredness.
• indefensible: This word means not able to be defended or justified against criticism or attack. An indefensible position or act is one that cannot be supported with reasons or arguments. This meaning is unrelated to tiredness.
• imperceptible: This word means impossible or difficult to perceive by the mind or senses. Something that is imperceptible is so slight, gradual, or subtle as not to be easily perceived. This meaning is also unrelated to tiredness.

Identifying the Correct One-Word Substitute

Comparing the definitions, it is clear that the word that means "Incapable of being tired" is indefatigable.

Let's summarize the meanings:

• Indefatigable: Cannot be tired.
• Inalienable: Cannot be taken away.
• Indefensible: Cannot be defended.
• Imperceptible: Cannot be easily perceived.

Based on this analysis, the best substitute for the phrase "Incapable of being tired" is 'indefatigable'.

Revision Table: Key Word Substitutes

Understanding common one-word substitutes is crucial for vocabulary building. Here's a quick look at the words from the options:

Additional Information: Expanding Vocabulary

One-word substitutes are a great way to enhance your vocabulary and improve your efficiency in expressing ideas. When you encounter a phrase, try to think if there's a single word that captures the same meaning. This practice helps in understanding nuances of English words.

For instance, instead of saying "a person who loves books very much," you can use the word "bibliophile." Instead of "a place where birds are kept," you can use "aviary." Learning these substitutes helps you communicate more precisely and effectively.

Regularly practicing with one-word substitution questions and focusing on the roots and prefixes of words (like 'in-' meaning 'not') can significantly boost your vocabulary skills for exams.