surprised

hardly, not altogether, not at all, not entirely, not in the least, not particularly, not totally, scarcely

I was hardly surprised when my train arrived late again.

a bit, faintly, a little, mildly, pretty, quite, rather, slightly, somewhat, vaguely

I was quite surprised when my old classmate suddenly called me after ten years.

constantly, continually

My teacher is constantly surprised by how quickly the students learn new vocabulary.

agreeably, pleasantly

She was agreeably surprised when her old friend suddenly called after five years.

at

My parents were surprised at how much their son had grown since last summer.

by

I was surprised by how delicious the homemade pizza turned out to be.