The term "more quickened" means to be stimulated, enlivened or energized. If we are looking for antonyms for this word, we should consider words that represent a lack of stimulation or liveliness. Some possible antonyms for "more quickened" could be "slowed down," "dulled," "depressed," "calmed," "soothed," or "sedated." These words all suggest a reduction in energy or activity, and the opposite of the state of being quickened. It is important to remember that antonyms are opposite in meaning, so when looking for antonyms for a word, we have to think in terms of what is the opposite of that word.