The word "laxed" means relaxed or not strict. Antonyms for laxed include strict, tense, uptight, formal, rigid, and severe. If you think of someone who is laxed, they might be easy-going and laid-back. However, if you use an antonym like strict, you would think of someone who is stern and inflexible. Similarly, uptight and formal are antonyms for laxed, describing someone who is reserved and rigid. In summary, antonyms for laxed prove to be useful when you want to describe someone with the opposite personality, demeanor, or attitude.