She was sad when she saw the empty cookie jar.  (full - empty)

When they had a sale, everything was so cheap. (cheap - expensive)

These shoes are uncomfortable after a long walk. comfortable ↔  uncomfortable

Her desk is always messy.   Tidy ↔ messy

A snakebite can be very dangerous (safe - dangerous ).

Honey is sweet. Lemon is Sour ↔  Sweet

Unlike her, her brother is mean to his friends.  (kind ↔ mean)

The air feels cool. I want to have some warm soup (cool - warm / cold - warm)

Jack is kind to strangers but he is cruel to his own family.  Kind ↔ cruel

She squeezed my hand tight (loose - tight)

That is such a interesting movie but its remake version is so boring ↔  interesting

The old clock belonged to his grandfather. (old - modern)

friendly ↔  unfriendly / rude ↔  polite The people here are really friendly and polite but the man I met this moring was really unfriendly and rude.