| No. | Item | Definition |
|---|---|---|
| 1. | accountability | serious responsibility for actions |
| 2. | alarm | serious fear or concern |
| 3. | anxiety | serious worried feeling |
| 4. | application | serious effort and attention |
| 5. | apprehension | serious anxious expectation |
| 6. | assiduity | serious and persistent effort |
| 7. | attentiveness | serious paying of attention |
| 8. | austerity | stern serious simplicity |
| 9. | brooding | serious dark thoughtfulness |
| 10. | burden | serious weight of responsibility |
| 11. | businesslike manner | serious efficient manner |
| 12. | candor | serious openness and honesty |
| 13. | care | serious attention and concern |
| 14. | caution | serious carefulness to avoid risk |
| 15. | commitment | serious dedication to something |
| 16. | composure | serious calm self-possession |
| 17. | concentration | serious focused attention |
| 18. | concern | serious interest or worry |
| 19. | consequence | serious importance or result |
| 20. | constancy | serious faithfulness and steadiness |
| 21. | crisis | serious dangerous turning point |
| 22. | dedication | serious devotion to a task |
| 23. | deliberateness | careful and serious intention |
| 24. | depth | seriousness of thought or feeling |
| 25. | determination | serious firmness of purpose |
| 26. | devotion | serious loyal commitment |
| 27. | dignity | serious and worthy bearing |
| 28. | diligence | careful serious work |
| 29. | disquiet | serious mental uneasiness |
| 30. | distress | serious pain or anxiety |
| 31. | duty | serious moral obligation |
| 32. | earnest concern | sincere serious worry |
| 33. | earnestness | sincere and intense seriousness |
| 34. | equanimity | serious mental calmness |
| 35. | firmness | serious strength or resolve |
| 36. | focus | serious directed attention |
| 37. | formality | serious adherence to convention |
| 38. | frankness | serious direct honesty |
| 39. | grave concern | very serious worry |
| 40. | grave demeanor | serious outward behavior |
| 41. | gravitas | dignified serious importance |
| 42. | gravity | weighty importance or solemnity |
| 43. | grimness | bleak serious quality |
| 44. | hardship | serious suffering or difficulty |
| 45. | hazard | serious source of danger |
| 46. | heed | serious attention or notice |
| 47. | honesty | serious truthfulness and sincerity |
| 48. | import | serious meaning or importance |
| 49. | importance | great significance or consequence |
| 50. | integrity | serious honesty and principle |
| 51. | judgment | serious considered decision-making |
| 52. | levelheadedness | serious calm good sense |
| 53. | matter-of-factness | plain practical seriousness |
| 54. | maturity | serious adult good sense |
| 55. | meditativeness | serious reflective mood |
| 56. | menace | serious threatening danger |
| 57. | moment | serious importance or significance |
| 58. | momentousness | great serious importance |
| 59. | obligation | serious binding duty |
| 60. | ordeal | serious painful experience |
| 61. | peril | serious danger |
| 62. | perseverance | serious endurance in effort |
| 63. | persistence | serious continued effort |
| 64. | poise | serious calm balance |
| 65. | pressure | serious demand or strain |
| 66. | professionalism | serious competent conduct |
| 67. | prudence | serious practical caution |
| 68. | purposefulness | serious sense of purpose |
| 69. | realism | serious practical outlook |
| 70. | regard | serious consideration or respect |
| 71. | reserve | serious restraint in manner |
| 72. | resolve | firm serious determination |
| 73. | responsibility | serious duty or accountability |
| 74. | restraint | serious self-control |
| 75. | reticence | serious reserve in speech |
| 76. | risk | possibility of serious harm |
| 77. | severity | harsh or grave seriousness |
| 78. | significance | serious meaning or consequence |
| 79. | sincerity | genuine seriousness of feeling |
| 80. | soberness | grave and serious quality |
| 81. | sobriety | seriousness free from frivolity |
| 82. | solemnity | serious and formal manner |
| 83. | somberness | dark serious mood |
| 84. | sternness | strict serious manner |
| 85. | strain | serious stress or pressure |
| 86. | substance | serious worth or importance |
| 87. | tenacity | serious persistence and determination |
| 88. | tension | serious strained feeling |
| 89. | thoroughness | serious complete care |
| 90. | thoughtfulness | serious careful consideration |
| 91. | threat | serious sign of danger |
| 92. | trouble | serious difficulty or concern |
| 93. | truthfulness | serious commitment to truth |
| 94. | unease | serious discomfort or worry |
| 95. | vigilance | serious alert attention |
| 96. | watchfulness | serious alert care |
| 97. | weight | importance and serious significance |
| 98. | weightiness | serious importance or force |
| 99. | wisdom | serious sound judgment |
| 100. | worry | serious concern or unease |