Or search: uneasily, anxiously
3 Syllables: SUU
chemistry, density, dentistry, enmity, entity
4 Syllables: USUU
Appendices, attentively, extensively, immensity, indemnity, intensity, intensively, offensively, propensity
5 Syllables: UUSUU
biochemistry, comprehensively

Found 16 words across 3 groupings.