| No. | Item | Definition |
|---|---|---|
| 1. | abrasion | wear from rubbing |
| 2. | abrasive contact | rough rubbing contact |
| 3. | abrasiveness | harshness causing irritation |
| 4. | acrimony | bitterness in speech or relations |
| 5. | alienation | feeling of separation or hostility |
| 6. | altercation | noisy argument or clash |
| 7. | animosity | strong ill will |
| 8. | antagonism | active opposition or hostility |
| 9. | argument | verbal disagreement |
| 10. | awkwardness | social discomfort or tension |
| 11. | bad blood | lasting resentment between people |
| 12. | barrier | obstacle to movement or agreement |
| 13. | binding | sticking that hinders movement |
| 14. | blockage | something that obstructs |
| 15. | bone of contention | cause of dispute |
| 16. | breach | break in relations |
| 17. | chafing | irritation from rubbing |
| 18. | clash | sharp conflict or opposition |
| 19. | coldness | lack of warmth in relations |
| 20. | conflict | active disagreement or clash |
| 21. | constraint | limiting condition or force |
| 22. | contact resistance | resistance at points of contact |
| 23. | contention | heated disagreement or dispute |
| 24. | contrariety | opposition or inconsistency |
| 25. | counterforce | force opposing motion |
| 26. | crosscurrents | conflicting forces or feelings |
| 27. | disaccord | lack of agreement |
| 28. | disagreement | difference of opinion |
| 29. | discord | lack of harmony |
| 30. | disharmony | absence of harmony |
| 31. | dispute | argument or conflict |
| 32. | dissension | disagreement causing conflict |
| 33. | dissonance | clashing elements or views |
| 34. | disunity | lack of unity |
| 35. | division | split caused by disagreement |
| 36. | drag | slowing resistance to movement |
| 37. | enmity | state of hostility |
| 38. | estrangement | state of being alienated |
| 39. | face-off | direct confrontation |
| 40. | falling-out | break in friendly relations |
| 41. | feuding | ongoing bitter conflict |
| 42. | flare-up | sudden outbreak of conflict |
| 43. | grate | rub harshly or irritate |
| 44. | grinding | rubbing with pressure |
| 45. | grip | surface hold or traction |
| 46. | hard feelings | resentment after conflict |
| 47. | hindrance | something that impedes progress |
| 48. | hitch | small problem or snag |
| 49. | holdback | something that restrains progress |
| 50. | hostile feeling | feeling of antagonism |
| 51. | hostility | unfriendly or antagonistic feeling |
| 52. | ill feeling | resentful or hostile feeling |
| 53. | ill will | unfriendly feeling |
| 54. | impediment | something that obstructs |
| 55. | incompatibility | inability to coexist smoothly |
| 56. | interference | obstructive involvement or effect |
| 57. | irritation | annoyance or inflamed rubbing |
| 58. | jar | have an irritating effect |
| 59. | jarring | causing irritation or discord |
| 60. | logjam | a blockage causing delay or conflict |
| 61. | misrelation | a poor or strained relationship |
| 62. | mistrust | suspicion or lack of trust |
| 63. | misunderstanding | failure to understand correctly |
| 64. | mutual hostility | shared antagonism |
| 65. | obstruction | something that blocks progress |
| 66. | odds | a state of disagreement |
| 67. | opposing force | force acting against another |
| 68. | opposition | resistance or conflict |
| 69. | problem | matter causing difficulty |
| 70. | quarrel | angry argument or dispute |
| 71. | resentment | bitter offended feeling |
| 72. | resistance | force working against motion |
| 73. | retarding force | force that slows movement |
| 74. | rift | serious break in relations |
| 75. | roadblock | thing that blocks progress |
| 76. | rolling resistance | resistance to rolling motion |
| 77. | roughness | lack of smoothness |
| 78. | rub | a difficulty or snag |
| 79. | rubbing | act of surfaces touching |
| 80. | run-in | brief angry encounter |
| 81. | schism | formal split from conflict |
| 82. | scraping | harsh rubbing against something |
| 83. | scuffing | surface rubbing and marking |
| 84. | seizing | locking from rubbing contact |
| 85. | shear resistance | resistance to sliding |
| 86. | spat | small quarrel |
| 87. | split | separation from disagreement |
| 88. | sticking | tendency to resist sliding |
| 89. | stiction | static resistance to movement |
| 90. | strife | bitter conflict or struggle |
| 91. | surface resistance | resistance between touching surfaces |
| 92. | tension | strained relations or pressure |
| 93. | tiff | minor argument |
| 94. | traction | grip between surfaces |
| 95. | tractional resistance | resistance related to grip |
| 96. | trouble | problem or conflict |
| 97. | uneasiness | feeling of discomfort or tension |
| 98. | variance | state of disagreement |
| 99. | wear | damage from repeated rubbing |
| 100. | wrangle | long noisy dispute |