Webster's English Dictionary

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treacherous

Cross references:
  1. faithless             
 
treach.er.ous \'trech-(*-)r*s\ aj 1: characterized by or manifesting 
   treachery : PERFIDIOUS  2a: likely to betray trust : UNRELIABLE {a ~ 
   memory}  2b: providing insecure footing or support {~ quicksand}  2c: 
   marked by hidden dangers, hazards, or perils  - treach.er.ous.ly av