If you tell someone something that is totally amazing or confusing, this is an example of astound.
Origin of astoundfrom Middle English astouned, astoned, past participle of astonien, astonish
transitive verba·stound·ed, a·stound·ing, a·stounds
Origin of astoundFrom Middle English astoned past participle of astonen to amaze ; see astonish .
(third-person singular simple present astounds, present participle astounding, simple past and past participle astounded)
(comparative more astound, superlative most astound)
- (obsolete) Stunned; astounded; astonished.
From Middle English astouned, astoned, astuned, past participle of astounen, astonen, astunen (“to astonish”).