Mentally challenged is one option.
An IQ test can be helpful in providing a measure of an individual's cognitive abilities, which can be used to identify strengths and weaknesses, inform educational placement, and assist with diagnosing intellectual disabilities or giftedness. It can also be used in research to investigate the relationship between intelligence and various outcomes.
Retardation is holding something back. In a way, applying the brakes in a car is retardation.
coming
Anyone can be an idiot, only those with 'mild mental retardation' can be a moron.From Wikipedia:"An idiot...is a mentally deficient person, or someone who acts in a self-defeating or significantly counterproductive way."Moron is a term once used in psychology to denote mild mental retardation."
Sort of, a little, sometimes
Do you mean mentally handicap? If so, it's because they are just born that way. There's no way someone can 'catch' retardation or downsyndrom. Just the way they are born. Now, if you're talking about 'commen sense mental', then the world will never know...
Giving up your mental strength.
Another way to say "due to the fact" is "because of."
A common phrase for that is "cheating the reaper".
It is another way of answering yes to a question.
'I extremely dislike you' is one way to say i hate you.
Not letting go of the past