Definition
Strict and serious in attitude or appearance; not allowing any leniency or softness.
Example
The teacher had a stern look on her face when the students misbehaved.
Conversation

I thought our teacher was going to be nice, but she has a pretty stern attitude.

Yeah, she definitely seems strict about the rules.

I guess we need to step up our game to avoid her stern looks during class.

For sure! Let's make sure we keep our assignments in check.
Synonyms & Antonyms
Definition
The back part of a ship or boat.
Example
The captain stood at the stern, looking out over the water.
Conversation

Have you ever been to the stern of a boat?

No, I haven't. What's it like?

It's really nice; you can see the whole view from the stern.
Root Explanation
Stern → The word originates from Old English 'styrne', meaning severe or strict. It describes a demeanor that is serious or harsh.
Memory Tip
Think of someone who is 'severe' or 'strict' — that's why 'stern' means serious or harsh.
Visually Confused Words
astern
tern
sten
yestern
western
unstern
stearin
sistern