this person is called a mute.
What is the english word for not being able to breastfeed the child?
The word for not being able to explain oneself is "inarticulate" or "incoherent."
The word for not being able to explain a theory is "incomprehensible."
The term for not being able to remember a word is "tip-of-the-tongue phenomenon."
you might not be able to get the child to talk about their problem.
The suffix -worthy means suitable for or suited to.
Unobtainable.
Unable
Precognition.
Inextricable
flightless
Being able to talk to someone who's far away.