Synonyms of gradual

1 Syllable
slow
2 Syllables
even, creeping, slowest, slower, gentle, steady
3 Syllables
piecemeal, regular, bit-by-bit, step-by-step, graduate, unhurried, continuous
4 Syllables
moderate, progressive, insensible, successive
5 Syllables
undetectable, unobservable, tortoiselike, imperceptible, inappreciable, imperceivable, imponderable