How Do AI Detectors Work? | Techniques & Accuracy

Published on November 27, 2024 by Kate Santoro, BS. Revised on March 12, 2026

AI detectors analyze text for patterns that commonly appear in machine-generated writing, such as highly predictable phrasing, low variation in sentence structure (often called low “burstiness”), and other linguistic features typical of language models. They rely on machine-learning classifiers trained on large datasets of both human and AI-written content, then use those patterns to estimate the likelihood a piece of text was generated by AI.

To see how these detection patterns apply to your own writing, try QuillBot’s AI Detector and get a quick estimate of whether your text might be flagged as AI-generated.

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Bad Synonyms | Uses & Example Sentences

Published on November 20, 2024 by Kate Santoro, BS. Revised on December 11, 2025

Bad is an adjective, adverb, and noun that has diverse meanings in English and almost always carries a negative connotation.

Bad can mean “of poor quality,” “morally unacceptable,” “unhappy,” “harmful,” “unhealthy,” “unhappy,” “unpleasant or unfavorable,” “naughty,” and “rotten.”

Some synonyms for bad are:

  • Poor
  • Awful
  • Wrong
  • Evil
  • Sad
  • Sorry
  • Dangerous
  • Detrimental
  • Ill
  • Sick
  • Miserable
  • Disobedient
  • Mischievious
  • Putrid
  • Off

QuillBot’s Paraphraser can help you find other synonyms for “bad” to reflect your intended meaning.

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Beautiful Synonyms | Uses & Example Sentences

Published on November 14, 2024 by Kate Santoro, BS. Revised on March 10, 2026

Beautiful is an adjective meaning “aesthetically pleasing” or “excellent.”

Some synonyms for beautiful include:

  • Gorgeous
  • Stunning
  • Breathtaking
  • Exquisite
  • Pulchritudinous
  • Ravishing
  • Wonderful
  • Outstanding
  • Magnificent
  • Fabulous
  • Exceptional
  • Terrific

Trying different synonyms for “beautiful” can change the tone of a sentence. QuillBot’s Humanize AI tool can help refine your wording so it still sounds natural and polished.

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Handsome in Spanish | 12 Words & Examples

Published on November 14, 2024 by Kate Santoro, BS. Revised on December 2, 2025

There are many words that mean handsome in Spanish, including:

  • Guapo
  • Atractivo
  • Bueno
  • Bonito
  • Apuesto
  • Agraciado
  • Bello
  • Majo
  • Lindo
  • Bien-parecido
  • Buenmozo
  • Machazo

In Spanish, the endings of adjectives change to agree in number and gender with the nouns and pronouns they describe. All of the adjectives in the list above are in the masculine, singular form. To make them plural, change the ending to “-os” (e.g., “guapos”).

These words mean handsome in Spanish when they carry the masculine endings. However, they can also be used in the feminine (e.g., “guapa”), which would translate more closely to English as “beautiful” or “pretty.”

A QuillBot Grammar Check can make sure you use these adjectives correctly with respect to gender and number.

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Certainly Synonyms | Uses & Example Sentences

Published on November 13, 2024 by Kate Santoro, BS. Revised on December 11, 2025

Certainly is an adverb that means “without doubt.” Certainly can modify adjectives, other adverbs, verbs, nouns, or entire phrases.

Some synonyms for certainly are:

QuillBot’s Paraphraser can help you find synonyms for “certainly” to reflect your intended meaning.

Continue reading: Certainly Synonyms | Uses & Example Sentences