Напишите эти слова в противоположном: например: happy- sad 2)old 3)small 4)pleasant 5)cloudy 6)uncomfortable 7)uninterested 8)unfriendly 9)untide 10)unhealthy

Old - new
small - big
pleasant - nasty
cloudy - clear
uncomfortable - comfortable
uninterested - interested
unfriendly - friendly
untidy - tidy
unhealthy - healthy 

А можно так.
old - young