Adverb
sporadically and infrequently
Source: WordNetThe simplest questions are the most profound. Where were you born? Where is your home? Where are you going? What are you doing? Think about these once in a while and watch your answers change. Richard Bach
It is good to have money and the things that money can buy, but it's good too, to check up once in a while and make sure you haven't lost the things money can't buy. George Horace Lorimer
Just once in a while let us exalt the importance of ideas and information. Edward R. Murrow
To truly love your wife, leave her alone every once in a while. Malay Proverb
Even a blind squirrel finds a nut once in a while. English Proverb
Even after healing, a man once mad would still shout "HOI” once in a while. Yoruba Proverb