Антоным до слова 1 decent g) pessimistic 2 beautiful a) indecent 3 intelligent b) silly 4 optimistic c) persistent 5 just d) ugly 6 hard-working e) lazy f) unjust

1a; 2d; 3с; 4g; 5f; 6e.

Decent - indecent
beautiful - ugly
intelligent - persistent
optimistic - pessimistic
just - unjust
hard-working - lazy
silly - ? (лишнее слово?)