WordReference English-Spanish Dictionary © 2015:

Principal Translations
liar nnoun: Refers to person, place, thing, quality, etc. ([sb] who lies repeatedly)embustero nmnombre masculino: Sustantivo de género exclusivamente masculino ("televisor", "piso").
  mentiroso nmnombre masculino: Sustantivo de género exclusivamente masculino ("televisor", "piso").
 
Additional Translations
liar interjinterjection: Exclamation--for example, "Oh no!" "Wow!" (accusation)¡mentiroso! interjinterjección: Interjección o exclamación, propia o impropia, de una sola palabra ("uy", "uf", "bravo", "viva").
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WordReference English-Spanish Dictionary © 2015:

Compound Forms:
pathological liar nnoun: Refers to person, place, thing, quality, etc. (person: lies compulsively)mentiroso patológico nm + adj
 That boy is a pathological liar, if his lips are moving, he's lying!
 No había ninguna razón para que me mintiera, es un mentiroso patológico.
  mentiroso compulsivo nm + adj
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'liar' found in these entries
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