(p. 507) durūha difficult, hard; stiff; incapable of being solved by arguments; difficult to know or cognize or comprehend; abstruse. ̃তা n. difficulty in understanding; stiffness; abstruseness. 10)

(p. 507) durjñē ẏa difficult to know or learn or cognize or comprehend; abstruse. ̃তা n. abstruseness; incomprehensibility, unknowableness. 27)

(p. 571) niguḍh় perfectly concealed; hidden, secret; covert; mystical, occult; extremely abstruse or intricate; mysterious; very profound or deep. নিগূঢ় অর্থ same as নিগূঢ়ার্থ । নিগূঢ় তত্ত্ব a mysterious truth or information, mysteries. ̃চ্ছেদ n. a secret cover. ̃তা n. perfect concealment; secrecy; occultness; extreme abstruseness or intricacy; mysteriousness; far-reaching profundity or depth. নিগূঢ়র্থ n. a hidden or underlying meaning or implication. নিগূঢ়ার্থক a. having a hidden or underlying meaning. 3)