Betray
Part of speech: verb
Definition: To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly; as, an officer betrayed the city. To prove faithless or treacherous to, as to a trust or one who trusts; to be false to; to deceive; as, to betray a person or a cause. To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known. To disclose or discover, as something which prudence would conceal; to reveal unintentionally. To mislead; to expose to inconvenience not foreseen to lead into error or sin. To lead astray, as a maiden; to seduce (as under promise of marriage) and then abandon. To show or to indicate; -- said of what is not obvious at first, or would otherwise be concealed.
Example sentence: Only trust thyself, and another shall not betray thee.
Fail
Part of speech: noun
Definition: a failure, especially of a financial transactiona failing grade in an academic examination
Part of speech: verb
Definition: To be unsuccessful.Not to achieve a particular stated goal. (Usage note: The direct object of this word is usually an infinitive.)To neglect.To cease to operate correctly.To be wanting to, to be insufficient for, to disappoint, to desert.To receive one or more non-passing grades in academic pursuits.To give a student a non-passing grade in an academic endeavour.
Example sentence: Men do not fail; they give up trying.