Understanding the 'dis-' Prefix in English

The question asks us to identify the word among the given options where the prefix 'dis-' does not form an antonym of another word. The prefix 'dis-' is commonly used in English to convey negation, removal, or reversal, thereby creating an opposite meaning (an antonym) of the base word.

Analyzing Each Option for 'dis-'

Let's examine each word to understand how the prefix 'dis-' functions within it:

• Disreputable: The base word is 'reputable', which means having a good reputation. By adding 'dis-', 'disreputable' means not reputable or having a bad reputation. Here, 'dis-' clearly functions as a negative prefix, forming an antonym.
• Distinguish: The word 'distinguish' means to recognize or point out a difference between two or more things, or to make oneself recognized for excellence. The 'dis-' in 'distinguish' is not acting as a prefix to negate a root word 'tinguish'. Instead, it is part of the original Latin root 'distinguere' meaning "to separate, divide". Therefore, 'distinguish' is not formed by adding 'dis-' to create an antonym of a positive base word.
• Dissatisfaction: The base word is 'satisfaction', which means the fulfillment of one's wishes, expectations, or needs, or the pleasure derived from this. By adding 'dis-', 'dissatisfaction' means the lack of satisfaction or a feeling of discontent. Here, 'dis-' acts as a negative prefix, forming an antonym.
• Disproportionate: The base word is 'proportionate', which means corresponding in size or amount to something else. By adding 'dis-', 'disproportionate' means too large or too small in comparison with something else; out of proportion. Here, 'dis-' functions as a negative prefix, forming an antonym.

Identifying the Non-Antonym 'distinguish'

Based on the analysis, 'disreputable', 'dissatisfaction', and 'disproportionate' all use 'dis-' as a prefix to create an antonym of their respective base words. However, 'distinguish' does not follow this pattern. The 'dis-' in 'distinguish' is integral to the word's etymology and meaning, rather than being a standalone prefix that negates a separate base word to form an antonym.

Therefore, 'distinguish' is the option where 'dis-' is NOT an antonym of another word by way of adding the prefix 'dis-'.