An antonym is a word that means something completely different to another word. Have you ever noticed when you look at a group of synonyms that the words don't share the exact same meaning? Each word is used in a slightly different way because synonyms are words with similar meanings, rather than being identical. In the same way, an antonym might not be the exact opposite for each word in a group of synonyms; they can also vary in strength
Appear
Depart
Disappear
Hide
Slack
Stretched
Tense
Tight
Boring
Dreary
Dull
Exciting
Caring
Comforting
Compassionate
Indifferent
Impervious
Resistant
Susceptible
Tough
Critical
Low-priority
Pressing
Top-priority
Horizontal
On end
Perpendicular
Upright
Quaking
Quivering
Shaking
Steady
Accept
Avoid
Evade
Ignore
Beginning
Conclusion
Consequence
Effect