"decorous" in the adjective sense
1. decorous
characterized by propriety and dignity and good taste in manners and conduct
"the tete-a-tete was decorous in the extreme"
2. becoming, comely, comme il faut, decorous, seemly
according with custom or propriety
"her becoming modesty"
"comely behavior"
"it is not comme il faut for a gentleman to be constantly asking for money"
"seemly behavior"
Source: WordNet® (An amazing lexical database of English)
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