unforgivable
adjective/ˌʌnfərˈɡɪvəbəl/
Frequency rank: #12,977 most common English word
Meaning
too bad or wrong to be forgiven; not excusable.

Example sentence
Lying to your best friend about something so serious is truly unforgivable.
Synonyms & related words
- inexcusable
- unacceptable
- unpardonable
- shameful
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