unsolvables
Problems without answers
Problems or puzzles that cannot be solved.
The term appears in mathematics and philosophy for questions proven to have no solution, and more casually for any intractable difficulty: Some of life's unsolvables aren't meant to be figured out.
Often used with a hint of resignation or acceptance.
Things in the way
- difficultiesProblems to overcome
- hardshipsSevere difficulties or suffering
- strugglesDifficult prolonged efforts
- adversitiesDifficult circumstances encountered
setbacks · hurdles · impediments · barriers · roadblocks · impossibilities · deadends · quagmires
Undetermined quantities
- secretsConcealed information
- phenomenaObservable facts or events
- supernaturalBeyond natural explanation
- paranormalBeyond scientific explanation
imponderables · occult · arcana · hidden · veiled · obscure · esoteric · abstruse
Logically incompatible assertions
- impossibilitiesThings that cannot exist
- antinomiesSelf-contradicting rational conclusions
- dilemmasDifficult choices between alternatives
- circularitiesSelf-referential reasoning patterns
Clue-based letter grid
- jigsawPuzzle or curve-cutting tool
- sudokuLogic grid puzzle
- brainteaserPuzzle demanding clever thought
- cryptogramCoded message puzzle
Unverified assumptions or theories
- proofsDemonstrations of truth
- theoremsProven mathematical statements
- haltingMarked by hesitation
- incompletenessState of lacking parts
obstacles
Things in the way
- difficultiesProblems to overcome
- hardshipsSevere difficulties or suffering
- strugglesDifficult prolonged efforts
adversities · setbacks · hurdles · impediments · barriers · roadblocks · impossibilities · deadends · quagmires · morasses
unknowns
Undetermined quantities
- secretsConcealed information
- phenomenaObservable facts or events
- supernaturalBeyond natural explanation
paranormal · imponderables · occult · arcana · hidden · veiled · obscure · esoteric · abstruse · cryptic
contradictions
Logically incompatible assertions
- impossibilitiesThings that cannot exist
- antinomiesSelf-contradicting rational conclusions
- dilemmasDifficult choices between alternatives
crossword
Clue-based letter grid
- jigsawPuzzle or curve-cutting tool
- sudokuLogic grid puzzle
- brainteaserPuzzle demanding clever thought
cryptogram · tangram · rebus · whodunit · mahjong · anagram · wordsearch
conjectures
Unverified assumptions or theories
unsolvablesno-brainers
Effortlessly obvious decisions
answerable · child's play · gimmes · slam dunks · low-hanging fruit