如何用簡單的英文來解釋這些英文單字?

Whatever the dictionary, the website ,we found the following to be useful:-
able:-an able body-- able player
---------capable, clever, competent (player), skilled, strong, talented.
malformation:-deformity, a deformed body, cripped, mulilated, twisted,

disability:-The accident temporaily disable him=a disabled person=cripple, enfeeble, handicap, impair, injure, lame, maim, paralyse, weaken.

positive:-He was positive that he was confident.
--------affirmative, assured, certain, convinced, decided, emphatic, helpful, practical, sure,

optimist:-optimism(n):-cheerfulness,confidence, hope, positiveness.
optimistic(adj) eg:-optimistic about our chances.
--------cheerful, confident, expectant, hopeful, positive.

http://www.merriam-webster.com
或許發問者手上沒有紙本英英字典
不過
你還有網路啊～