Filled with or motivated by zeal; fervent.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "zealous" in a sentence
"Tonight, 12 House Republican congressmen outraged by what they call the zealous and unjust sentences, they've sent a letter to President Bush."
"Yet in this work he can find no words sufficiently strong to praise what he calls the zealous freedom and Christian earnestness of one of the most offensive canters that the whole range of fiction presents."
"When he came nearest to the scientific spirit of his time, in zealous observations of the life of nature, he characteristically concentrated on the sequence of various bird notes at daybreak and the flight of moths as the stars of twilight were kindled."