Not often; infrequently or rarely. See Usage Note at rarely.(adverb)
Archaic Infrequent; rare.(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 "seldom" in a sentence
"His expression seldom changes, with his cool stare and clenched jaw, the product of military schooling, but he's no less demanding or intense than Carril once was."
"And at the risk of seeming importunate, I daresay humble is a word seldom applied to you, my lord Rolande."
"The elusive Monti characteristically clung to the shadows, his name seldom surfacing even in the annals of the French occult world."