Impossible to resist: an irresistible impulse to sneeze. (adjective)
Having an overpowering appeal: irresistible beauty. (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 "irresistible" in a sentence
"The rattling of this lure and its swimming action make in irresistible to trout."
"Mr. Shindo's film appeals on many levels, but what makes it irresistible is its exquisite melding of stark black-and-white cinematography and intensely evocative sound design, in which the continually rustling vegetation is virtually an additional character."
"TV on the Radio represent everything that is good and right about the Brooklyn indie scene from which they emerged -- they are restlessly experimental but grounded in irresistible melodies."