loudly and aloud

Loudly is used (like loud) to talk about the strength of a noise. The opposite is quietly.

• They were talking so loudly I couldn’t hear myself think.

Aloud is often used with the words read and think, to say that words are spoken, and not just ‘said’ silently in the head.

• She has a very good pronunciation when she reads aloud.
• ‘What did you say?’ ‘Oh, nothing. I was just thinking aloud.’