tontería
/tonteˈɾia/ · A2 · noun · f
trivial thing
🤡 tonto (silly, dumb) + -ería (-ery) = silly-ery: nonsense, a trifle
Built from tonto, meaning foolish, plus the noun suffix -ería, the same ending as English -ery in foolery or tomfoolery. So a tontería is a piece of foolery: a dumb remark, or something too trivial to matter.