Sentence examples for have proven unable from inspiring English sources
Their dense urban forms and limited space have proven unable to handle increased traffic.
The rebels have proven unable to take and hold major towns like Juba and Wau.
Although several methods tackling this problem have been published, they have proven unable to effectively resolve the situation if a system has continuous control factors.
The partisan nature of the debate is one reason why green groups have proven unable to enlist the support of their corporate allies.
In some cases, the agency has forced drugs off the market after some doctors have proven unable to prescribe them safely.
Yet, many countries have proven unable to effectively deploy their security institutions (including regular militaries, paramilitaries, and police) when responding to such threats even if they have sufficient resources at their disposal.
In department after department, year upon year, ministers have proved unable to implement effective policies.
The thinking and people from that campaign have proved unable to fast-forward a dozen years.
From populist opprobrium to elitist disdain — standard social behavioral devices have proved unable to dent humanity's greedy nature.
