WordReference English-Spanish Dictionary © 2014:

Principal Translations
molestar vtrverbo transitivo: Verbo que requiere de un objeto directo ("di la verdad", "encontré una moneda"). (perturbar) (interrupt peace)bother, disturb vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
  (cause annoyance)be a nuisance loc verb
 Me molesta el ruido nocturno y no me deja dormir.
 The night noises bother (or: disturb) me and don't let me sleep.
molestar vtrverbo transitivo: Verbo que requiere de un objeto directo ("di la verdad", "encontré una moneda"). (tener: dolor leve) (cause pain)hurt vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
 Le molesta la rodilla al bajar las escaleras.
 His knee bothers him when he goes down the stairs.
molestar vtrverbo transitivo: Verbo que requiere de un objeto directo ("di la verdad", "encontré una moneda"). (ofender) (cause indignation)upset, offend vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
  hurt vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
  (annoy)bother vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
 Le molestó que hablaran así de su padre.
 It upset (or: offended) him that they talked about his father that way.
molestarse v prnlverbo pronominal: Verbo que se conjuga con un pronombre átono ("me", "te", "se") que concuerda con el sujeto ("lavarse", "irse", "enojarse"). (ofenderse)be offended v aux + past p
  (UK)take offence v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end."
  (US)take offense v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end."
 Se molestó porque no le invitaron a la boda.
 He was offended because they didn't invite him to the wedding.
molestarse v prnlverbo pronominal: Verbo que se conjuga con un pronombre átono ("me", "te", "se") que concuerda con el sujeto ("lavarse", "irse", "enojarse"). (hacer un favor) (inconvenience yourself to do [sth])take the trouble, make the effort v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end."
 Ana es muy amable; se molestó en ir a verme al hospital en su día libre.
 Ana is very kind: she took the trouble (or: made the effort) to come to see me in the hospital on her day off.
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WordReference English-Spanish Dictionary © 2014:

Compound Forms:
molestar a alguien loc verblocución verbal: Unidad léxica estable formada de dos o más palabras que funciona como verbo ("sacar fuerzas de flaqueza", "acusar recibo"). (incordiar a alguien)bother [sb], annoy [sb] vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
  (colloquial)bug [sb] vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
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'molestar' found in these entries
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