(ف) جَهَدَ يَجْهَدُ جَهْدًاjahada yajhadu jahdan: to expend strength on a task, to strive, to bring every resource to bear in striving. ﴿وَاَقْسَمُوْا بِاللّٰهِ جَهْدَ اَيْمَانِهِمْ﴾ (Al-Anʿām 6:109)
جُهْدٌjuhd (noun, ism dhāt): effort, exertion. ﴿وَالَّذِيْنَ لَا يَجِدُوْنَ اِلَّا جُهْدَهُمْ﴾ (At-Tawbah 9:79)
Form III (mufāʿalah) جَاهَدَ يُجَاهِدُ مُجَاهَدَةً وَجِهَادًاjāhada yujāhidu mujāhadatan wa-jihādan: to expend effort against someone, to struggle, to strive to the utmost. ﴿وَالَّذِيْنَ جَاهَدُوْا فِيْنَا لَنَهْدِيَنَّهُمْ سُبُلَنَا﴾ (Al-ʿAnkabūt 29:69)
جَاهِدْjāhid (imperative verb, amr): struggle, strive. ﴿يٰٓاَيُّهَا النَّبِيُّ جَاهِدِ الْكُفَّارَ وَالْمُنٰفِقِيْنَ﴾ (At-Tawbah 9:73)
مُجَاهِدٌmujāhid (active participle, ism fāʿil): one who strives, who wages jihad. ﴿وَفَضَّلَ اللّٰهُ الْمُجٰهِدِيْنَ عَلَي الْقٰعِدِيْنَ اَجْرًا عَظِيْمًا﴾ (An-Nisāʾ 4:95)
Form VIII (iftiʿāl) اِجْتَهَدَ يَجْتَهِدُ اِجْتِهَادًاijtahada yajtahidu ijtihādan: to make every possible effort (this verb is not used in the Quran).