Words or thoughts that have not been spoken or expressed out loud, remaining silent or unspoken between people.
Simple prefix 'un-' (not) combined with 'said' (past tense of say, from Old English 'secgan'); the word is relatively modern, emphasizing absence of speech.
'The unsaid' has become a powerful concept in modern psychology and literature—psychologists study the importance of unspoken communication and hidden feelings, recognizing that what we don't say is sometimes as powerful as words.
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