Synonyms of unpredicted

2 Syllables
startling, shocking, sudden, chance, stunning
3 Syllables
amazing, fortuitous, surprising, wonderful
4 Syllables
impulsive, unlooked-for, accidental, astonishing, electrifying, unexpected, unforeseen, remarkable
5 Syllables
unpredictable, extraordinary
6 Syllables
unanticipated