Directions: Pick the odd one out.

The task is to identify the word that is not synonymous with the others. 'Rare', 'Uncommon', and 'Unusual' all mean not occurring very often or not common - they are synonyms. 'Ordinary' means common, usual, or not special - the opposite of rare/uncommon. Therefore, 'Ordinary' is the odd one out because it means common or usual, while the other three words all mean uncommon or rare - making it the antonym of the other three.