The notion of disastrous comes from the Latin word nefastus. It's about a adjective which can be used to qualify a time, a day or other temporary period that results adverse, disastrous or fateful .
For example: “Yesterday I had a disastrous day: I fought with my girlfriend, I argued with my boss and I lost my glasses”, “2018 was a disastrous year for the singer, since he lost a millionaire trial that his former representative started and also had to fight against several health problems”, "The capital team is having a disastrous month, with four losses in the same number of matches played".
It is also mentioned as harmful to the thing or to the individual who, by his characteristics or conditions, is considered abhorrent or detestable : “Ramírez was a nefarious governor who made poverty grow throughout the region”, “This restaurant is ominous: the waiters attend poorly, the food is horrible and the prices are very high”, “My neighbor is a nefarious man who does not respect anyone and is always willing to argue for any reason.”.
Take the case of a stadium of soccer whose playing field is full of wells with zones no grass . In addition the lines that mark the areas and the edges are almost imperceptible. Given this situation, journalists mention that the field in question is in a ominous state .
Suppose, on the other hand, that two teams of basketball (basketball ) are facing with a very even marker. In the last quarter, however, one of the teams fails sixteen of twenty throws to the basket and loses the ball eight times. For that grim period , said team ends up suffering a clear defeat.