/ Thesaurus / S Synonyms of safe period Find synonyms for: Noun1. safe period, phase, stageusage: that time during a woman's menstrual cycle during which conception is least likely to occur (usually immediately before of after menstruation)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language