A propensity is a natural tendency to behave in a particular way — something in a person that already leans that way, often without a big decision. A propensity to talk too much; a propensity for late nights.

A propensity一個propensity is是 a natural tendency to behave in a particular way一種自然而然朝某種方式行動的傾向——something in a person一個人身上已經有的東西 that already leans that way原本就偏向那個方向，often without a big decision通常不需要經過什麼重大決定。A propensity to talk too muchpropensity to talk too much（話太多的傾向）；a propensity for late nightspropensity for late nights（愛熬夜的傾向）。

It is a fairly formal, written word. In speech most people say tendency, habit, or “he’s always doing that.” Though actually, unlike some nearby words that sound stern, propensity is not automatically an insult: you can have a propensity to kindness as well as a propensity to panic.

It它 is是 a fairly formal, written word一個相當正式、偏書面的字。In speech在口語裡 most people say大多數人會說 tendency, habit, or "he's always doing that."tendency、habit，或是「他就是老愛這樣」。Though actually不過其實，unlike some nearby words that sound stern跟一些聽起來很嚴厲的相近詞不同，propensitypropensity is not automatically an insult不必然是負面批評：you can have a propensity to kindness你可以有propensity to kindness（善良的傾向） as well as a propensity to panic也可以有propensity to panic（容易恐慌的傾向）。

It often takes to or for: a propensity to + verb, a propensity for + noun. You will meet it in essays, news analysis, and psychology more than in a text to a friend.

It它 often takes常常搭配 to or fortor或for：a propensity to + verbpropensity to+動詞，a propensity for + nounpropensity for+名詞。You will meet it你會在文章、新聞分析和心理學裡遇到它 in essays, news analysis, and psychology（合併） more than in a text to a friend比較少出現在給朋友的簡訊裡。

It is countable: a propensity, propensities.

It它 is是 countable可數詞：a propensity, propensitiespropensity、propensities。