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When referring to someone for whom it is difficult or impossible to walk or move without some kind of external aid like crutches or a wheelchair, sensitivity is called for. The noun cripple and the adjective crippled are no longer considered appropriate. Although these terms have been in use since before the year 950, since the mid-1900s they have become increasingly uncommon and are largely regarded as insulting. Since the late 20th century, the terms handicapped and the handicapped, once thought to be acceptable alternatives, have also become, at least in some contexts, offensive. ( Handicapped remains acceptable, however, in certain set phrases like handicapped parking. ) Attempts to replace crippled with the milder euphemistic term physically challenged were sidetracked by a virtual explosion of satirical imitations like economically challenged (poor), ethically challenged (immoral), and vertically challenged (short). Currently acceptable terms are disabled and people with disabilities. These terms are not only less likely to offend, they are more useful. While cripple and crippled traditionally denoted permanent impairments of one or more limbs, disabled is a broader, more comprehensive word that can refer to many different kinds of physical or mental impairments, whether temporary or permanent. cripple and crippled are not usually problematic when referring to an inanimate object or an animal. And cripple is unlikely to be deemed offensive as a verb, especially metaphorically, as in Failing to upgrade the computer system will cripple our business. Like many other usually offensive terms, the word cripple can also be acceptable when used by people with disabilities in self-reference, as an act of reclamation, or for political purposes. retarded ( def ).