Question

retarded 【retarded】v.阻碍；妨碍I was retarded from keeping an appointment by a business conference that lasted most of the day.开了几乎一整天的商业会议，使我无法赴约。

Accepted Answer

[rɪ'tɑːrdɪd] 
retardedrelatively slow in mental or emotional or physical development
Retarded is a word to describe someone who is mentally slow. This is a medical word that spread to slang, and is today considered very insulting and inappropriate.
Some uses of retarded are harmless, like if you said wearing a backpack retarded or slowed down your progress on a hike. However, if you use retarded to mean stupid, you're on dangerous ground. Out of respect for people who have clinical mental retardation, this is considered an offensive term to throw around.
All forms of 'retarded' will appear on average once every 2563 pages.retardretardationretarded

Front	retarded
Pron	[rɪ'tɑːrdɪd]
Back	【retarded】 v.阻碍；妨碍 I was retarded from keeping an appointment by a business conference that lasted most of the day. 开了几乎一整天的商业会议，使我无法赴约。
Vocab	retardedrelatively slow in mental or emotional or physical development Retarded is a word to describe someone who is mentally slow. This is a medical word that spread to slang, and is today considered very insulting and inappropriate. Some uses of retarded are harmless, like if you said wearing a backpack retarded or slowed down your progress on a hike. However, if you use retarded to mean stupid, you're on dangerous ground. Out of respect for people who have clinical mental retardation, this is considered an offensive term to throw around. All forms of 'retarded' will appear on average once every 2563 pages. retard retardation retarded

Retarded Mental Word Considered Rɪ'Tɑːrdɪd V.阻碍；妨碍 I Keeping