Answer:
Grave, in-depth, somber, solemn, stern, grim, etc.
Step-by-step explanation:
Serious: (of a subject, state, or activity) demanding careful consideration or application.
Sorry if this is a bit dull.
a serious look could be described as such : '' she shoots me with and icy stare"
you use tools such as metaphors , and hyberboles , and etc.
i hope this helps :)
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