sin

You might not want to be the one at the party who takes the last piece of cake, but then again, it would be a sin to let it sit there, uneaten. A sin is a deeply regrettable action.

The most common definition of sin is religious: it's an immoral act against God or divine law. Any serious offense, even if it's not religious, can be called a sin, and so can something less serious if you're talking about it in a joking way, as in, "You've got to buy those shoes — it would be an absolute sin not to." In math, sin is the abbreviation of sine, the trigonometric function.

Definitions of sin
  1. noun
    an act that is regarded by theologians as a transgression of God's will
    synonyms: sinning
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    types:
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    fall
    a lapse into sin; a loss of innocence or of chastity
    actual sin
    a sin committed of your own free will (as contrasted with original sin)
    original sin
    a sin said to be inherited by all descendants of Adam
    deadly sin, mortal sin
    an unpardonable sin entailing a total loss of grace
    venial sin
    a pardonable sin regarded as entailing only a partial loss of grace
    pride, superbia
    unreasonable and inordinate self-esteem (personified as one of the deadly sins)
    envy, invidia
    spite and resentment at seeing the success of another (personified as one of the deadly sins)
    avarice, avaritia, covetousness, greed, rapacity
    reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)
    acedia, laziness, sloth
    apathy and inactivity in the practice of virtue (personified as one of the deadly sins)
    anger, ira, ire, wrath
    belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)
    gluttony, gula, overeating
    eating to excess (personified as one of the deadly sins)
    lust, luxuria
    self-indulgent sexual desire (personified as one of the deadly sins)
    type of:
    evildoing, transgression
    the act of transgressing; the violation of a law or a duty or moral principle
  2. noun
    estrangement from god
    synonyms: sinfulness, wickedness
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    types:
    mark of Cain
    the mark that God set upon Cain now refers to a person's sinful nature
    type of:
    unrighteousness
    failure to adhere to moral principles
  3. noun
    violent and excited activity
    “they began to fight like sin
    synonyms: hell
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    type of:
    activity
    any specific behavior
  4. verb
    commit a sin; violate a law of God or a moral law
    synonyms: transgress, trespass
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    types:
    fall
    yield to temptation or sin
    type of:
    breach, break, go against, infract, offend, transgress, violate
    act in disregard of laws, rules, contracts, or promises
  5. verb
    commit a faux pas or a fault or make a serious mistake
    synonyms: blunder, boob, drop the ball, goof
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    type of:
    breach, break, go against, infract, offend, transgress, violate
    act in disregard of laws, rules, contracts, or promises
  6. noun
    the 21st letter of the Hebrew alphabet
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    type of:
    alphabetic character, letter, letter of the alphabet
    the conventional characters of the alphabet used to represent speech
  7. noun
    ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
    synonyms: sine
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    type of:
    circular function, trigonometric function
    function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
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