Most antifreeze solutions contain high levels of ethylene glycol, an ingredient that, once metabolized, is extremely toxic to dogs and cats. Pets are often attracted to the liquid because of its sweet taste. Even small amounts can be lethal to animals.
Wiktionary(0.00 / 0 votes)Rate this definition: arduous(Adjective) Needing or using up much energy; testing powers of endurance. The movement towards a peaceful settlement has been a long and arduous political struggle.
The definition of strenuous is something that takes a lot of effort, work or energy to do. An example of strenuous is hiking to the top of Mount Everest. requiring or characterized by great effort or energy: a strenuous game of handball. vigorous, arduous, zealous, etc.: strenuous efforts.