- 1901 uncurbable
- 1902 uncurbed
- 1903 uncurbing
- 1904 uncurbs
- 1905 uncurdled
- 1906 uncured
- 1907 uncurious
- 1908 uncurl
- 1909 uncurled
- 1910 uncurling
- 1911 uncurls
- 1912 uncurrent
- 1913 uncurse
- 1914 uncursed
- 1915 uncurses
- 1916 uncursing
- 1917 uncurtailed
- 1918 uncurtain
- 1919 uncurtained
- 1920 uncurtaining
- 1921 uncurtains
- 1922 uncurved
- 1923 uncus
- 1924 uncustomarily
- 1925 uncustomary
- 1926 uncustomed
- 1927 uncut
- 1928 uncute
- 1929 uncuttable
- 1930 uncynical
- 1931 uncynically
- 1932 undam
- 1933 undamaged
- 1934 undammed
- 1935 undamming
- 1936 undamned
- 1937 undamped
- 1938 undams
- 1939 undanceable
- 1940 undaring
- 1941 undashed
- 1942 undate
- 1943 undated
- 1944 undauntable
- 1945 undaunted
- 1946 undauntedly
- 1947 undauntedness
- 1948 undawning
- 1949 undazzle
- 1950 undazzled
- 1951 undazzles
- 1952 undazzling
- 1953 unde
- 1954 undead
- 1955 undeaf
- 1956 undeafed
- 1957 undeafing
- 1958 undeafs
- 1959 undealt
- 1960 undear
- 1961 undebarred
- 1962 undebased
- 1963 undebatable
- 1964 undebatably
- 1965 undebauched
- 1966 undecadent
- 1967 undecayed
- 1968 undeceivable
- 1969 undeceive
- 1970 undeceived
- 1971 undeceiver
- 1972 undeceives
- 1973 undeceiving
- 1974 undecent
- 1975 undecidabilities
- 1976 undecidability
- 1977 undecidable
- 1978 undecided
- 1979 undecidedly
- 1980 undecidedness
- 1981 undecideds
- 1982 undecillion
- 1983 undecimal
- 1984 undecimole
- 1985 undecipherable
- 1986 undeciphered
- 1987 undecisive
- 1988 undeck
- 1989 undecked
- 1990 undecking
- 1991 undecks
- 1992 undeclared
- 1993 undeclining
- 1994 undecomposable
- 1995 undecomposed
- 1996 undecorated
- 1997 undedicated
- 1998 undee
- 1999 undeeded
- 2000 undefaced