Properly means in the correct and complete way. Do it properly, properly cooked, not properly closed.
In British English it is also an intensifier meaning thoroughly or genuinely: properly cold, properly funny, properly lost. That use is common in speech and rare in writing. Note proper, which in British informal speech means real or complete — a proper meal, a proper mess; and properly speaking, which introduces a pedantic correction and is usually right.
1adverbproperlyIn the correct and complete way.
“The door has never closed properly since the frame moved.”
synonyms: correctly, thoroughly
2adverbgenuinelyGenuinely or thoroughly, used for emphasis.
“It was properly cold by about four in the afternoon.”
Too few real examples of this word to estimate which sense is commonest.
properly is a manner of correctness.
Also accepted in games: correctly
Proto-Indo-European
*preyH-
Anglo-Norman
propre
Middle English
propre
English
proper
English, today
properly
From proper + -ly. proper comes from Middle English propre, from Anglo-Norman propre. From Middle English propre, from Anglo-Norman proper, propre, Old French propre (French: propre), from Latin proprius.
Etymology from Wiktionary, CC BY-SA