The antonyms for the phrase "were dilatory" are prompt, punctual, and efficient. Dilatory means slow, procrastinating, and delaying. Therefore, the opposite of dilatory is prompt or quick, which means doing something without any delay or hesitation. Punctual refers to being on time, arriving or doing something at the exact pre-agreed time. Efficient means doing a task effectively and efficiently with minimal wastage of time, resources or energy. In summary, the antonyms of "were dilatory" all describe someone who is punctual, efficient, and proactive in completing their tasks without any delay.