"At odd times" is an idiomatic expression that refers to an occurrence happening at irregular or unexpected intervals. Synonyms for this phrase include "sporadically," "erratically," "unexpectedly," "intermittently," "occasionally," "irregularly," and "randomly." Each of these words indicates that something is happening in an unpredictable or irregular fashion. For example, someone might say "the phone rings sporadically throughout the day" or "he shows up unexpectedly at odd times." Using a synonym for "at odd times" can help to add variety to your writing and make it more interesting and engaging for readers.