klyftig betyder på engelska

bright [brighter, brightest]▼(having a clear, quick intellect, see also: intelligent)
adjective
[UK: braɪt] [US: ˈbraɪt]

intelligent▼(of high or especially quick cognitive capacity, bright)
adjective
[UK: ɪn.ˈte.lɪ.dʒənt] [US: ˌɪn.ˈte.lə.dʒənt]

sharp [sharper, sharpest]▼(intelligent)
adjective
[UK: ʃɑːp] [US: ˈʃɑːrp]

smart [smarter, smartest]▼adjective
[UK: smɑːt] [US: ˈsmɑːrt]