occasionally

• Abe lashed out with the sword occasionally, striking even around corners to blind and maim. —  The Last Oracle by James Rollins
• The young farmer in question possessed only a very elementary education, and had never been taught French, yet almost from the moment when he first began to speak he occasionally interpolated a French word in his conversation, and the practice extended as he grew older. —  Two Gallant Sons of Devon A Tale of the Days of Queen Bess
• At other times he made his appearance flushed with success--occasionally, also, with drink,--and flung down a heavy bag of golden nuggets as the result of his evening's play. —  Twice Bought
• Sir Emerson Tennent writes of a curious horn or excrescence which grows on the head of the jackal occasionally, which is regarded by the Singhalese as a potent charm, by the instrumentality of which every wish can be realised, and stolen property will return of its own accord! —  Natural History of the Mammalia of India and Ceylon
• Sara heard them exchange a word occasionally, but for the most part they simply stood about, fanning themselves and coiling and uncoiling their springs. —  The Garden of the Plynck

Roget's II: The New Thesaurus