The phrase "all aquiver" means to be in a state of excitement, emotional intensity, or nervousness. The antonyms of "all aquiver" are calm, composed, cool, collected, nonchalant, relaxed, and unemotional. Whereas, calm indicates a state of peace and tranquility, composed refers to a state of being in control and displaying self-awareness. Cool implies a detached, unflappable demeanor. Collected suggests a state of being calm and attentive. Nonchalant denotes a casual and indifferent attitude. Relaxed implies a release of tension or stress. Unemotional denotes a lack of feelings or emotions.