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WordNet-Online
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Adjective treacherous has 2 senses
- treacherous, unreliable - dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle"
Antonym: safe (indirect, via dangerous)
- punic, perfidious, treacherous - tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans; "Punic faith"; "the perfidious Judas"; "the fiercest and most treacherous of foes"; "treacherous intrigues"
Antonym: faithful (indirect, via unfaithful)
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