Synonyms of solely

1 Syllable
but
2 Syllables
onliest, wholly, simply, singly
3 Syllables
disjointly, purely, totally, barely, merely
4 Syllables
singularly, uniquely, completely, personally, entirely
5 Syllables
individually, separately, undividedly, intrinsically, solitarily, exclusively, single-handedly
8 Syllables
individualistically