Latin has several words for 'speak, say', one of which is fārī

at first glance, fārī might not seem to have any English descendants. However, its present participle is fāns, meaning 'speaking'

something that does not speak, therefore, is an īnfāns - like a baby, or an infant

there is in fact a whole family of English words that derive from fārī (or its ancestors)

for example, its past participle gives us fātum 'speech, declaration, destiny', origin of English 'fate'

the same root also led to fābula 'tale', whence come English 'fable' and 'fabulous'

my favourite Latin relative of fārī is fās 'divine law'

I like fās because it belongs to a small group of Latin nouns that are indeclinable - that is, it never changes according to case or number

an evil deed that went against fās was a nefās, the origin of English 'nefarious'