"Didst one bit" is an archaic way of saying "didn't care at all" or "was indifferent." Synonyms for this phrase include "disinterested," "unconcerned," "apathetic," "nonchalant," "uninterested," and "insouciant." These words convey a sense of detachment or lack of interest in a particular matter. Other synonyms for "didst one bit" may include "cold," "aloof," "distant," "detached," and "unemotional." These words might suggest a sense of being emotionally disconnected or withdrawn from a situation. Regardless of the words used, they all convey a similar sentiment of not caring about something.