'less effectiveness' is a correct and usable phrase in written English.
You can use it to describe something that is not as effective as it could be. For example: "Our team has been working hard, but the results have been hampered by our less effectiveness."
And that often translates into less effectiveness and more side effects and complications than seen in the trials.
NASA was not receptive, she said, and "this set a stage for less effectiveness".
Alternatives providing significantly less effectiveness than other, more promising alternatives may be eliminated.
The other component parts of the system could still function, and did in fact function, though with less effectiveness than if the United States had fully participated therein.
The currently available shingles vaccine, called Zostavax, only prevents about half of shingles cases in those over age 60 and has demonstrated far less effectiveness among elderly patients.
When the SSI effect is significant, the proposed control system can still reduce the structural responses, however, with less effectiveness than that of the assumed fixed-base model.
Ground R has less aeration effectiveness than A. However, when co-milling of FCC + R was carried out, advantageous performance GECC was attained.
Focusing on the experiences of four Muslim families between January 2003 and July 2005, the film portrays the immigration services (the I.N.S. was dissolved in 2003 and absorbed into the Department of Homeland Security) as a "uniquely dysfunctional" bureaucracy whose actions were motivated less by effectiveness than by the desire to appear proactive.
Google and much of the tech press are collectively freaking out over the alleged United Nations plot to "take over" the Internet being proposed at a gathering of the International Telecommunication Union (ITU), but alarmists ignore a very important fact: The United Nations has little authority and even less historical effectiveness.
But what seems to be missing is any solid substantiation of claims about the size of the strike, much less its effectiveness.
Provisions of RV1 vaccine alone or diarrhoea management alone are both less cost effectiveness alternatives.
