Webster's Revised Unabridged Dictionary · 1913

Unawares

Unawares , adverb

Without design or preparation; suddenly; without premeditation, unexpectedly.
Mercies lighting unawares. — J. H. Newman
Lest unawares we lose This our high place, our sanctuary, our hill. — Milton
He breaks at unawares upon our walks. — Dryden
So we met In this old sleepy town at unaware. — R. Browning