20 Most Common Prefixes Found in Frequently Used Prefixed Words prefix unrein-, im-, ir-, ildisen-, em- nonin-, im overmissub- preinterforede- trans- super- common meaning 1. not 2. opposite of, contrary to 1. again, anew 2. backwards, back 1. not examples # words percentage 1. unhappy 2. unrest 782 26.4% 1. rebuild 2. react 401 13.6% 1. inactive, immobile, 313 irrational, illegal 1. not 1. dissimilar 216 2. opposite of 2. disfavor 3. remove 3. discolor 1. put or go into 1. encage, embed 132 or onto 2. endear, emblaze 2. to cause to be 1. not 1.nonhuman 126 1. into, inside, 1.inbound, immerge, 105 within illuminate 1. above, too 1.overuse 98 much 1. bad, wrong 1. misconduct 83 2. failure, lack 2. misfire 1. below, under 1. subsoil 80 2. secondary 2. subplot 3. less than 3. subhuman complete 1. before, in 1. prehistoric 79 front of 1. between, 1. international 77 among 1. before, in 1. forerunner 76 front of 1. make 1. decriminalize 71 opposite of 2. dethrone 2. remove 3. declass 3. reduce 1. across, 1. transatlantic 47 beyond 2. transcribe 2. change 3. transfer 3. through 1. above, over 1. superimpose 43 10.6% 7.3% 4.5% 4.3% 3.5% 3.3% 2.8% 2.7% 2.7% 2.6% 2.5% 2.4% 1.6% 1.5% semi- antimidunder- 2. superior 3. excessive 1. half 2. partial 3. happening two times during 1.opposite, counteracting 1.middle 1.beneath, below, less in degree 2. superfine 3. supercharge 1. semicircle 2. semiconscious 3. semimonthly 1.antigravity, antibody 1.midstream 1.underage 39 1.3% 33 1.1% 33 25 1.1% .8% Total: 2,859 96.6% Adapted from: White, T.G., Sowell, J., & Yanagihara, A. (1989). Teaching elementary students to use word-part clues. The Reading Teacher, 42, 302-308. From: Sedita, J. (2009). The key vocabulary routine. Danvers, MA: Keys to Literacy.