Most important synonyms (speak more diversely):
Good — fine, of high quality, healthy, proper, fit, gifted, robust, skilled, suitable, appropriate, full, considerable, obedient, polite, courteous, pleasing, smart, great, wonderful, interesting;
Bad — improper, inappropriate, unsuitable, unfit, poor, inferior, unsatisfactory, difficult, unfavorable, disagreeable, critical, grave, severe, terrible, awful, harmful, damaging, evil, indecent, invalid;
Beautiful — wonderful, gorgeous, spectacular, good-looking, pretty, handsome (for men), lovely, stunning, magnificent, cute, pleasing, splendid;
Interesting — exciting, amusing, curious, delightful, fascinating, lovely, engaging, stimulating, readable, provocative, refreshing, unusual, enchanting.