Most free TTS engines filter profanity. Try spacing out letters: "f*ck" often works. For full swearing, Tortoise-TTS on Colab has no filters.
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"The", "this", and "that" often sound like "de", "dis", and "dat". Most free TTS engines filter profanity
Introduce fictional segments or read noir-style detective scripts with an authentic, gritty narrator. and "that" often sound like "de"