| tentative method(expression, idiom, experiment) |
| tilt(noun, event, fight, struggle, match) |
| touchstone(noun, check, rule, approval, examination) |
| trial and error(noun, expression, idiom, study, check) |
| unproven(adjective, experimental) |
| unverified(adjective, experimental) |
| whirl(noun, trouble, go, bother, crack) |
| afflict(noun, verb, torment) |
| aggravation(noun, upset, trouble, bother, strain) |
| aim(noun, work, energy, struggle, try) |
| analytical(adjective, experimental) |
| angst(noun, pain, sorrow, torment, misery) |
| assize(noun, regulation) |
| bad news(noun, expression, trouble, ruin, concern) |
| balloon(adjective, tentative, experimental, probationary, investigative) |
| bid(noun, go, work, try, attempt) |
| bind |
| bitter pill(noun, expression, idiom, pain, depression) |
| blue book(noun, expression, study, check, review) |
| bore(noun, bother, routine, annoyance, drag) |