WordReference English-Spanish Dictionary © 2015:

Principal Translations
frightened by [sth] adj + prep (scared by)asustado por adj + prep
  tener miedo de loc verblocución verbal: Unidad léxica estable formada de dos o más palabras que funciona como verbo ("sacar fuerzas de flaqueza", "acusar recibo").
 The sheep were frightened by the storm.
frightened of [sb/sth] adj + prep (scared of)asustado de adj + prep
  tener miedo a loc verblocución verbal: Unidad léxica estable formada de dos o más palabras que funciona como verbo ("sacar fuerzas de flaqueza", "acusar recibo").
 It's quite common to be frightened of spiders.
 
Additional Translations
frightened adjadjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house." (scared)asustado adjadjetivo: Describe el sustantivo. Puede ser posesivo, numeral, demostrativo ("casa grande", "mujer alta").
  aterrado adjadjetivo: Describe el sustantivo. Puede ser posesivo, numeral, demostrativo ("casa grande", "mujer alta").
 When the dog started barking loudly I was frightened.
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WordReference English-Spanish Dictionary © 2015:

Compound Forms:
be frightened by [sth] v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end." (be startled or scared by [sth])asustarse con v prnl + prep
  asustarse de v prnl + prep
 I was frightened by the dog when he started to bark loudly.
 Mi madre siempre se asusta con el estruendo de los truenos.
 Me asusté del perro cuando empezó a ladrar fuerte.
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'frightened' found in these entries
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