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1.
The definition of speechless according to credited sources:

- Unexpressed or inexpressible in words

This word can be used to describe several situations but the purpose of this definition is to highlight the feeling of breathlessness one feels when that special someone's perfection just can't be explained in words. It is used to adequately (yet still highly inadequately) express the way that special person makes you feel with one look, one word, one gesture, one smile... Just that person's existence can leave you... well... speechless.
You are the most amazing man and you just leave me speechless with your inner and outer beauty. Everything that you are leaves me unable to express the inexpressible. Speechless you leave she.
 
2.
The definition of speechless according to credited sources:

- Unexpressed or inexpressible in words

This word can be used to described several situations but the purpose of this definition is to highlight the feeling of breathlessness one feels when that special someone's perfection just can be explained in words. It is used to adequately (yet still highly inadequately) express the way that special person makes you feel with one look, one word, one gesture, one smile... Just that person's existence can leave you... well... speechless.
You are the most amazing man and you just leave me speechless with your inner and outer beauty. Everything that you are leaves me unable to express the inexpressible. Speechless you leave she.
 
3.
1 : unable to speak : DUMB 2 : not capable of being expressed in words 2 : not speaking : SILENT
"After all, she was only speechless"

"That trauma made him speechless"
by Rodrigo C.S. Silveira July 03, 2006
 
4.
means suffering of autism
speechless
by MissCubans April 12, 2010