Which word is a Latin antonym for 'calidus', having one 'L'?

The correct answer is based on understanding that 'calidus' means 'warm' or 'hot' in Latin. The antonyms in the provided options are all terms that describe coldness.

Frigidus translates to 'cold' and is commonly used to describe very low temperatures.

Algidus also means 'cold' and has a similar usage, often implying a chill.

Gelidus means 'icy' or 'frosty,' which alludes to a temperature that is extremely cold.

Since all three words convey the idea of coldness and serve as antonyms to 'calidus', this makes them all valid responses. However, each of these words only contains one 'L', aligning with the question's requirement. Thus, the answer reflects that all the options presented fulfill both the antonym requirement and the specification regarding the letter 'L'.