infrangible
131insoluble — Synonyms and related words: coherent, cohesive, enwrapped in mystery, impartible, indefinable, indiscerptible, indissoluble, indissolvable, indivisible, inexplicable, inextricable, infrangible, infusible, inseparable, insolvable, mysterious,… …
132rigid — Synonyms and related words: abiding, accurate, adamant, adamantine, at a standstill, attentive, austere, buckram, careful, cast iron, changeless, close, conscientious, constant, continuing, correct, critical, delicate, demanding, detailed,… …
