"Hadst qualms" refers to a feeling of doubt, hesitation, or unease about something that one has done or is about to do. The antonyms for "hadst qualms" would be words or phrases that describe an absence of doubt or hesitation, such as confidence, ease, certainty or conviction. When a person has confidence in their actions, they do not have any qualms or reservations. Similarly, when a person is sure of their decision, they do not hesitate or doubt themselves. Therefore, the antonyms for "hadst qualms" would be words that convey a sense of assurance and certainty, rather than hesitation and doubt.