The word "appropriate" means correct or proper and since the little prefix "in" turns its meaning around, something inappropriate is considered not proper or suitable.
Nowadays, it seems, anything goes. Yet good manners and standards prevail, and some things are simply inappropriate — such as taking a toddler to a violent movie, or making jokes at someone else's expense. You wouldn't show your future father-in-law naked pictures of his daughter or wear a bathing suit to a state dinner. Those actions are simply inappropriate.
adj not suitable for a particular occasion etc
not appropriate for a purpose or occasion
of an inappropriate or incorrectly applied nature
not suitable or right or appropriate
suitable for a particular person or place or condition etc
the quality of ability and work that is appropriate for students in a specified grade
exactly suited to the occasion
appropriate for a condition or purpose or occasion or a person's character, needs
of an appropriate or pertinent nature
marked by suitability or rightness or appropriateness
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