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All answers having "Speechless" as clue:

3 Character Answers:

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MUM



4 Character Answers:

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AWED

DUMB

MUTE



5 Character Answers:

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AGAPE

INAWE

MUTED



6 Character Answers:

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AGHAST

AMAZED

SILENT



7 Character Answers:

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APHASIC

ATALOSS

INSHOCK



10 Character Answers:

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TONGUETIED



12 Character Answers:

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LOSTFORWORDS



15 Character Answers:

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ATALOSSFORWORDS