mentally handicapped 
adjective dated or offensive
(Of a person) having very limited intellectual functions: a mentally handicapped child [as plural noun]: she works with the mentally handicapped...
- Children were excluded if they were diagnosed as mentally handicapped or if they had a pervasive developmental disorder.
- The health care needs of severely mentally handicapped children are being neglected because of an over-emphasis on education, their parents have claimed.
- But there have been heart-rending stories, such as an elderly woman with no support forced to stay home to look after her mentally handicapped daughter.
- worth while (or worth one's while)
- worthy
- -worthy
- wot
- Wotan
- wotcha
- wotcher
- Wouk, Herman
- would
- would-be
- would not touch someone/thing with a bargepole
- wouldn't
- wouldn't be seen (or caught) dead
- wouldn't hurt (or harm) a fly
- wouldn't say boo to a goose
- wouldn't you like to know?
- wouldst
- would you Adam and Eve it?
- would you believe (it)?
- Woulfe bottle
- wound
- Wounded Knee, Battle of
- wounding
- woundingly
- woundless