'The beneficiary is unable to speak due to her disabilities' is correct.
A newborn mouse will be unable to do anything at death since it will cease to live. You need to be more precise with your question in order to get a better answer.
Someone who is unable to speak or be understood.
A person who can not or will not speak is known as a 'mute'
Aphrasia is the condition of being unable to speak.
They are unable to verbalise or speak.
If someone is unable to speak, it's called being 'dumb'.
If someone is unable to speak, it's called being 'dumb'.
I assume you mean "Was Helen Keller unable to speak", to which the answer is she did learn to speak.
Mute,dumb or aphasic.
To be unable to speak because of strong emotion.
They may be slow to speak but they usually are OK. They have the IQ of 50.