Pretentious

a person who is annoying because they constantly try to show off how clever or knowledgeable they are

Enough with the smart-ass remarks.Can't you just have a normal conversation without trying to be a jerk?

used to describe a person who behaves in a very traditional and morally conservative manner

If she continues to behave prim and proper, she will make an excellent impression at the event.

someone who is very strict and thinks in a very traditional way

Don't be such a Mrs. Grundy; it's okay to have a little fun and be adventurous sometimes.

used to describe someone who continuously talks about what they are planning to do, but they never do or achieve much

He talks a big game about starting his own business, but so far, he's all talk and no action.

a person who insists on giving advice about something even though they are not forced to do so

As I was working on the project, my colleague kept being a backseat driver, constantly telling me how to do my job despite not having the same expertise or experience.

a person who tries to gain the approval of important people by the means of flattery, praise, etc.

He's always complimenting the boss and offering to do extra tasks, trying to be the biggest apple polisher in the office.

a serious flaw or weakness in one's character that other people are not aware of

The celebrity's glamorous image crumbled when it was revealed that they had feet of clay, struggling with addiction behind the scenes.

used to describe a person who tends to say things that sound intimidating when in reality they are afraid to take action

Don't worry about his threats; he's all bark and no bite.He won't actually do anything to harm us.

an individual who consistently seeks to appear more clever than others in a manner that can be bothersome

He has a reputation for being a wise guy.

a person who tries hard to let others know that they always do the right thing and behave well

He constantly brags about his charitable donations and impeccable ethical choices.It's clear he's just a goody two shoes seeking attention.

an annoying individual who behaves as if they know everything

During the game, he made fun of the opposing team's mistakes, acting like a smart aleck and rubbing it in their faces.