Sucktastic is a colloquial term used to describe something that is incredibly bad or disappointing. Antonyms for this word would be adjectives that describe things positively. For instance, superb, excellent, fantastic, amazing, wonderful, great, and outstanding are some exemplary examples of antonyms of sucktastic. Generally, antonyms of sucktastic refer to things which are highly satisfying or impressive, rather than demotivating or unfulfilling. So, whenever you want to describe a scenario, situation, movie or anything else which is highly worthy of appreciation, you can always use these antonyms to replace the negative connotation conveyed by the term sucktastic.