Use 'layman' to specify someone's lack of expertise in professional or technical settings. In the medical field, I'm just a layman.
Pro Tip 2/3
Simplifying Terms
Say 'in layman's terms' when simplifying complex ideas for a general audience. Can you explain quantum physics in layman's terms?
Pro Tip 3/3
Everyday Usage
'Layman' is informal and often used to humble oneself or acknowledge a conversational partner's expertise. As a layman, your detailed insight is invaluable to me.