"Arduously" is a word in ENGLISH

Steep and lofty, in a literal sense; hard to climb.

Attended with great labor, like the ascending of acclivities; difficult; laborious; as, an arduous employment, task, or enterprise.

The quality of being arduous; difficulty of execution.

Hard to do or to make; beset with difficulty; attended with labor, trouble, or pains; not easy; arduous.

The state of being difficult, or hard to do; hardness; arduousness; -- opposed to easiness or facility; as, the difficulty …

That which is undertaken; something attempted to be performed; a work projected which involves activity, courage, energy, and the like; …

Difficult to accomplish; full of obstacles; laborious; fatiguing; arduous; as, a hard task; a disease hard to cure.

kakúlì - (H) Slowness, arduousness, hardness, laboriousness, irksomeness, toilsomeness, condition of something that is achieved only step by step with …

mabúdlay - Laborious, toilsome, arduous, tedious, wearisome, irksome, tiresome, tiring, tired. (búdlay).

An adjective suffix meaning full of, abounding in, having, possessing the qualities of, like; as in gracious, abounding in grace; …

palakúsgan - (H) Anything that needs force, great efforts or application; arduous, laborious, hard, difficult. (cf. kusúg, kúsug).

ugba v {1} [A; a1] work arduously, earnestly. Adlaw-adlaw muugba si Pidru sa íyang uma arun mabúhì ang pamilya, Pe-dro …