Synonyms of aback in English:

aback

adverb

Phrases

take someone aback

Joanna was taken aback by the violence of his reaction
dumbfound, daze, nonplus, stop someone in their tracks, stupefy, take someone's breath away;
shake (up), jolt, throw, unnerve, disconcert, disturb, disquiet, unsettle, discompose, bewilder
informal flabbergast, knock for six, knock sideways, knock out, floor, strike dumb

Definition of aback in:

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Word of the day bimble
Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace