"Total inability" means the complete lack of ability or power to do something. It describes a situation where someone is completely unable to perform a particular action or task. Full definition
Here is what I believe about total inability as it relates to faith. (redeeminggod.com)
Yes... if total inability refers to humans not being able to save themselves by their own efforts. (redeeminggod.com)
Isaiah 53:6 and Isaiah 64:6 are not really referring to the Total Depravity or total inability of mankind at all, but are rather teaching the important truth that while we are all sinners, the worst sin we can commit is the religious sin of performing empty and meaningless acts of righteousness which are intended to please and appease God and trying to make ourselves look holy and righteous in the eyes of others. (redeeminggod.com)