Antonyms are words that have the opposite meaning of a given word, for example: beautiful – ugly; convenient – inconvenient. In both Bulgarian and Spanish, an antonym is either a word with a different root or is formed from the given word through prefixes.
First, I offer you some information about forming antonyms with the help of prefixes:
-in
cómodo – incómodo (convenient – inconvenient)
alámbrico – inalámbrico (wired – wireless)
estable – inestable (stable – unstable)
capaz – incapaz (capable – incapable)
adecuado – inadecuado (appropriate – inappropriate) etc.
-im (when the word begins with p)
preciso – impreciso (precise – imprecise)
personal – impersonal (personal – impersonal)
perfección – imperfección (perfection – imperfection)
posible – imposible (possible – impossible)
potencia – impotencia (power – powerlessness), etc.