If a word or a name is pronounceable, you can say it out loud without much trouble. Your mouth can make the sounds, and other people can hear it as a real word.

If a word or a name is pronounceable如果一個字或名字是pronounceable you can say it out loud without much trouble你就可以不太費力地把它唸出來。Your mouth can make the sounds你的嘴巴發得出那些音 and other people can hear it as a real word別人也能聽出那是一個真的字

Teachers use this a lot with names from other languages: some names feel easy for English speakers, and some do not. Though actually, “easy” depends on who is talking — a name that feels hard in English may be perfectly easy in another language.

Teachers use this a lot with names from other languages老師常用這個字講其他語言來的名字 — some names feel easy for English speakers有些名字對說英語的人來說很好唸 and some do not有些則不是。Though actually不過其實 "easy" depends on who is talking「好唸」要看是誰在說 — a name that feels hard in English一個在英語裡覺得難的名字 may be perfectly easy in another language在另一個語言裡可能完全不難

People also stretch it a little for invented words, brand names, and passwords.

People also stretch it a little人也會把這個字用得寬一點 for invented words, brand names, and passwords用在自創的字、品牌名和密碼上

The opposite is unpronounceable, which speakers sometimes say, not very kindly, about a word they cannot get their tongue around.

The opposite相反詞 is unpronounceable是unpronounceable which speakers sometimes say有時候人會用這個字 not very kindly不太客氣地 about a word they cannot get their tongue around形容一個他們唸不出來的字

It is an ordinary, slightly school-like word, not slang and not very formal.

It這個字 is an ordinary, slightly school-like word是個普通、有點像課本用語的字 not slang and not very formal不是俚語，也不算太正式