Very short. / (sciences) Extremely short in duration, typically on the femtosecond scale / (physics, of a wave) Having a wavelength of between 1 and 10 metres

(finance) A bond with an extremely short term, typically less than a year

Extremely or excessively sensitive.

Extremely secure

Extremely or exceedingly small

Extremely slim

In a ultrasensitive way.

Very smooth

Simplified to a very great extent.

Third-person singular simple present indicative form of ultrasimplify