• Fahmida's journey abroad for higher study became torturous rather than simple.

• Tortuous (adjective)
- English Meaning: Full of twists and turns; not straight or direct.
- Bangla Meaning: আঁকাবাঁকা: a tortuous path; (লাক্ষণিক) জটিল, প্যাঁচানো: a tortuous man.

Synonyms: Twisting (মোচড়), Curving (কুঁচন), Sinuous (আঁকাবাঁকা; ঘোরানো; পাকানো)।
Antonyms: Straight (সরস; ঋজু; সিধা), Straightforward (সহজবোধ্য; সহজসাধ্য), Direct (সরাসরি)।

Example Sentence:
1. His so-called shortcut turned out to be tortuous and slow.
2. After one hour of search, we found a tortuous road up the mountain.

Other options:
ক) arcane (Adj)
- English Meaning: known or knowable only to a few people: secret.
- Bangla Meaning: গোপনীয়; রহস্যময়।

খ) milieu (Noun)
- English Meaning: the physical or social setting in which something occurs or develops: environment.
- Bangla Meaning: পরিবেশ; সামাজিক পারিপার্শ্বিকতা; পারিপার্শ্বিক অবস্থা; প্রতিবেশ।

ঘ) ascetic (Adj)
- English Meaning: practicing strict self-denial as a measure of personal and especially spiritual discipline.
- Bangla Meaning: কৃচ্ছ্রব্রতী; আত্মনিরোধী; কঠোর; কঠোর তপশ্চর্যাপূর্ণ।

Source: Live MCQ's Vocabulary Booster, Accessible Dictionary, Merriam-Webster Dictionary.