Synonyms of unfamiliarly

2 Syllables
queerly
3 Syllables
curiously, strangely, startlingly, rarely, strikingly
4 Syllables
uncommonly, abnormally, remarkably, uniquely, amazingly, surprisingly, unusually, peculiarly
5 Syllables
astonishingly, exotically, fantastically, indescribably, unnaturally, exceptionally