One of the mysteries of the English language finally explained.
1‘he always behaved towards her in a decorous way’
proper, seemly, decent, becoming, befitting, tasteful, in good taste
tactful, correct, appropriate, suitable, fitting, fit
polite, well mannered, well behaved, genteel, refined, polished, well bred, dignified, respectable, courtly, civilized
formal, reserved, modest, demure, sedate, staid, gentlemanly, ladylike
comme il faut
indecorous, unseemly, immodest
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