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• The meaning of the word 'Mettlesome' is Zealous.

• Mettlesome
- Bangla Meaning: তেজস্বী; তেজোদ্দীপ্ত।
- English Meaning: full of mettle: spirited.

খ) Zealous
- Bangla Meaning: উদ্দীপনাময়; গভীর অনুভূতিবহ; আগ্রহোদ্দীপক।
- English Meaning: marked by fervent partisanship for a person, a cause, or an ideal: filled with or characterized by zeal.

• Zealous, not Jealous(ঈর্ষাকাতর, ঈর্ষাপরায়ণ).

• Other options:
ক) Flaunting
- Bangla Meaning: সগর্বে/সদর্পে আন্দোলিত হওয়া বা করা।
- English Meaning: to display or obtrude oneself to public notice.

গ) Denigrate
- Bangla Meaning: মানহানি/কালিমালেপন করা।
- English Meaning: to attack the reputation of : defame.

ঘ) Relegate
- Bangla Meaning: নিম্ন পদ বা অবস্থায় অপসারিত করা; পর্যবসিত করা।
- English Meaning: to send into exile : banish.

Source: Merriam-Webster Dictionary, Accessible Dictionary, Cambridge Dictionary.