ontology (noun) philosophy: principles, knowledge
Sinonime: baffling,
difficult,
impenetrable, indecipherable, inexplicable, inextricable, irresolvable, mystifying, obscure, unaccountable, unconcluded, unfathomable, unresolved, unsolvable, unsolved
Antonime: explainable, explicable,
obvious,
open, solvable