Lethal-enough to kill most people
A lethal dose of poison could still be survived in rare cases
Fatal-killed someone
The car crash was fatal (the driver was killed)
It’s more definite. The ie a lethal dose could be survived, or it could be fatal.
Deadly-a high potential to kill
The plane crash was deadly (some people were killed, but there were still survivors)
More of a hypothetical, rather than an exact measurement like lethal.
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