certainly -- probably
pupil -- teacher
asleep -- awake
immigration -- emigration
senior -- junior
friend -- enemy
About Random Antonym Words Tool
This page generates 6 sets of antonyms by default, from the common 579 antonyms, the "antonyms" mentioned here are not very strict. Some words are only relative but make us feel antonyms. This is a great tool to help you review and develop your knowledge of English.
In the meantime, you can also generate antonyms in the specified number. We added a small feature, click the word text with the mouse, it will automatically select the appropriate text, this is a convenient copy tool.