Error, mistake.
"The programmer spent hours fixing a bad line of code that caused the entire system to crash."
In plain English: A bad is an insult used to describe someone who is annoying, unpleasant, or not worthy of respect.
"The bad in this movie was mostly the acting and the unrealistic plot."
Usage: Use "bad" as a noun only when referring to an error or mistake within specific technical contexts like computing or data processing. In standard English, it is almost exclusively an adjective describing poor quality, so avoid using it as a standalone noun in casual conversation.
alternative past of bid. See bade.
"He carefully bad a walnut to extract the kernel for his recipe."
To shell (a walnut).
In plain English: To make something worse or ruin it by doing something stupid.
"The rain will not damage the car, so there is no need to worry about bad effects on the paint."
Usage: Bad (verb) means to crack open and remove the shell from nuts, like walnuts or pecans. Use it as in, "Please bad these walnuts for the salad."
having undesirable or negative qualities
"a bad report card"
"his sloppy appearance made a bad impression"
"a bad little boy"
"clothes in bad shape"
"a bad cut"
"bad luck"
"the news was very bad"
"the reviews were bad"
"the pay is bad"
"it was a bad light for reading"
"the movie was a bad choice"
not financially safe or secure
"a bad investment"
"high risk investments"
"anything that promises to pay too much can't help being risky"
"speculative business enterprises"
Unfavorable; negative; not good.
"The weather forecast predicted bad conditions for our hiking trip, so we decided to stay home instead."
In plain English: Bad means not good or of poor quality.
Usage: Use "bad" to describe anything that is unfavorable, negative, or simply not good in quality or condition. It serves as a common intensifier before adjectives like "bad idea" or "bad luck," but avoid using it where specific terms like "evil" or "ill" convey the intended meaning more precisely.
Badly.
"After falling down the steep hill, he was badly hurt and had to go to the hospital immediately."
In plain English: Bad means not good or of poor quality.
"The movie was bad enough to make us leave halfway through."
Usage: Use "bad" as an adverb only in informal speech when you mean "very badly," such as in the phrase "I can't bad it." Standard English requires the adverb form "badly" for all other situations.
The word "bad" comes from Middle English, where it originally meant wicked or depraved. Its origins are uncertain, but it may be a shortened form of an Old English word for hermaphrodite or related to a verb meaning to defile.