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What is the opposite of STD?

STD may be an abbreviation of standard, or may be an initialism meaning:

1. (telephony) Subscriber trunk dialing/subscriber toll dialing.

2. Short-term disability.

3. Sexually transmitted disease.

Here's a list of antonyms for standard.

Adjective
Opposite of used or accepted as normal or average
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“The narrative uses an unconventional method to describe the change in the protagonist.”
Adjective
Opposite of of recognized authority
“The unofficial action began early in the morning when pickets were placed outside the station.”
Adjective
Opposite of used or accepted broadly
Adjective
Opposite of of a satisfactory or acceptable quality
Adjective
Opposite of not special or different in any way
“We were loved and cherished by extraordinary teachers, with whom I remained friends with in later life.”
Adjective
Opposite of of a satisfactory or acceptable quality
Adjective
Opposite of having no strong positive or negative features
“The politician's speech was dramatic and struck a chord with those who had attended his rally.”
Adjective
Opposite of fixed or arranged in advance
“They may trap you for several years on a variable rate which could prove expensive in the long run.”
Adjective
Opposite of tolerably acceptable in standard
“Our customers know they can depend on us to maximize their resources and deliver a superior level of support.”
Adjective
Opposite of following the established standards of behavior or manners
“His mother advised that it was inappropriate for him to not wear a morning suit or a lounge suit.”
Adjective
Opposite of behaving in a regular manner
“After almost an hour and a half had passed an unexpected electronic bleep disturbed the silence.”
Adjective
Opposite of known but specified in a general and nonexplicit sense
“He left seeking yet another unrecognized area of research.”
Noun
Opposite of a required or agreed level of quality or attainment
“We are worried about the unimportance placed on safety regulations in this current workspace.”
Noun
Opposite of a principle or standard by which something may be judged or decided
Noun
Opposite of a person or thing viewed as a model of excellence
Noun
Opposite of a standard or rule by which others follow or are judged
Noun
(usually used in plural form "essentials") Opposite of a fundamental element or characteristic
“Frankly, I find the minutia of everyday life much more interesting than the glaring important life-changing events that shape our lives.”
Noun
Opposite of a person or thing regarded as precious or special
Noun
Opposite of something used as the basis for calculation or for comparison
Noun
Opposite of moral principles that govern the conduct of a person or organization
Noun
Opposite of an original model, typically serving as a template for others
Noun
Opposite of an indication of the degree of something, or the standard for which others will be compared to
Noun
Opposite of a high standard by which others are measured
Noun
Opposite of an ideal example of someone or something
“Since stagnation is the antithesis of growth, it is also the antithesis of life.”
Noun
Opposite of a rule used to determine one's choices
Noun
Opposite of a standard or pattern that is typical or expected
Noun
Opposite of an arrangement or design serving as a model for comparable objects
“The KF5 is an excellent tank, but some felt that the airflow was a massive deviation from past models.”
Noun
Opposite of the best or most ideal of its kind
Noun
Opposite of something or someone that serves as a pattern of behavior to be imitated
“As a franchise consultant, he was a great advocate of the proven systems and processes established by McDonald's.”
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