The word "faddiest" refers to something that is trendy or fashionable for a short period of time. Antonyms for this word could be timeless, classic, enduring, everlasting, or timeless. These words have opposite meanings to faddiest because they suggest something that is not temporary or short-lived, but instead has stood the test of time and will remain relevant and significant for years to come. Other antonyms for faddiest may include enduring, traditional, lasting, or established. By using antonyms for the word faddiest in our writing and speech, we can express ideas that are more enduring and meaningful, rather than short-lived and superficial.