| rigid(adjective, strain, firmness, labour, hardness) |
| robust(adjective, strain, firmness, labour, hardiness) |
| substantial(adjective, strain, firmness, labour, hardiness) |
| unyielding(adjective, strain, firmness, labour, hardness) |
| conviction(noun, confidence, assurance, certainty, undoubtedness) |
| test(noun, study, check, cause, reason) |
| testimony(noun, information, mark, cause, knowledge) |
| certainty(noun, confidence, assurance, truth, undoubtedness) |
| conclusion |
| confirmation(noun, check, information, mark, sign) |
| veracity(noun, truth) |
| verification(noun, support, study, check, measure) |
| reasoning(noun, reason, case, claim, analysis) |
| truth(noun, truth) |
| validation(noun, display, true, approval, evidence) |
| attestation(noun, information, mark, sign, true) |
| axiom(noun, support, action, base, beginning) |
| consequence |
| knowledge(noun, action, understanding, information, experience) |
| reason(noun, support, action, cover, cause) |