strenuous
stren-u-ous / strĕn-yo͞o-əs
adjective 1. requiring a great deal of effort, exertion or endurance I wish to preach, not the doctrine of ignoble ease, but the doctrine of the strenuous life. Theodore Roosevelt, 1858 - 1919 2. energetic, active, zealous Let your hearts be filled with the strenuous desire that tranquillity and harmony may encircle all this warring world. Abdu'l-Bahá, 1844 – 1921