A person who takes everything seriously can be described as "earnest," "serious-minded," or "solemn." Informally, you might also use terms like "killjoy" or "buzzkill" if their seriousness dampens the mood in social situations. Additionally, "literal-minded" can apply if they interpret things in a very serious or straightforward way without humor.
what do you call a person that takes everything seriously
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what do you call a person that likes to look cool in front of their crush
A person who tries to look cool in front of their crush can be described as "trying to impress" or "putting on a show." Informally, you might refer to them as "showing off" or "playing it cool." If they are overly concerned with their appearance and demeanor to gain admiration, they might be called "self-conscious" or "vain." Sometimes, the term "smitten" is used to describe someone who behaves this way due to their affection for someone else.