Synonyms of rarely

2 Syllables
hardly, scantly, seldom, little, extra
3 Syllables
curiously, notably, strangely, startlingly, barely, scarcely, uncommon, finely, unoften
4 Syllables
singularly, uncommonly, remarkably, amazingly, detectably, infrequently, extremely, whimsically, unfrequently, unusually
5 Syllables
exotically, fantastically, indescribably, unfamiliarly, sporadically, terrifically, inhabitually
6 Syllables
extraordinarily, prohibitively