imsure "No doubt about it!" Confident comment "No doubt about it" Confident reply "Yeah, right..." ''No question'' Positive thinker's remark? "There's no doubt!" "There's no doubt about it" "No question about it" "Yeah, right" Sarcastic reply "Undoubtedly" "Yeah, right!" "Without a doubt" "Likely story" "No doubt in my mind" 'Yeah, right!' "No question" "No question!"