the GNU version of the Collaborative International Dictionary of English
adj. Having no ruth; cruel; pitiless.
The Century Dictionary and Cyclopedia
Having no ruth or pity; cruel; pitiless; barbarous; insensible to the miseries of others.
Unmodified or unrestrained by pity; marked by unfaltering rigor; relentless; merciless: as, ruthless severity.
Synonyms Unpitying, hard-hearted.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. without mercy or pity
Word Usage
"Over Microsoft's formative years when they redefined the term ruthless, my friends and I worked for several startup and small companies that were crushed by Microsoft which they then bought for pennies on the dollar."