Question

Почему НЕУЛОВИМО пишется слитно?Заранее спасибо:*

Answer 1

Слитно, потому что "неуловимо" - это наречие к прилагательному "неуловимый". Но если бы между "не" и "уловимо" стояло "слишком", то, полагаю, было бы раздельно. Не слишком уловимо, не вполне ощутимо. 

Answer 2

Why is "НЕУЛОВИМО" written as one word?

The word "НЕУЛОВИМО" is written as one word in Russian because it is a compound word formed by combining the prefix "НЕ-" (meaning "not") and the adjective "УЛОВИМО" (meaning "catchable" or "unattainable"). When these two elements are combined, they form a new word with a specific meaning that cannot be easily deduced from the individual parts. In Russian, it is common for compound words to be written as one word, especially when they are formed by combining a prefix with a base word.

Source: - [Source 1]