Be Mortified To Do vs. Mortified At Something
Be Mortified To Do vs. Mortified At Something distinguishes two attested complement patterns for the same adjective. Use mortified + to-infinitive for the adjective followed by its documented complement pattern; use mortified at + noun phrase for the separately documented construction. The constructions are not interchangeable simply because they share the adjective; choose the pattern that matches the grammatical relationship you mean.
Use mortified + to-infinitive when the adjective introduces that documented complement; use mortified at + noun phrase when you mean the second documented relationship.
Key details
Choose the right form
| Meaning / situation | Construction | Decision |
|---|---|---|
| embarrassment or shame connected with an event expressed as an infinitive | mortified + to-infinitive | use the documented infinitival construction |
| embarrassment or shock directed at a named event, behavior, or fact | mortified at + noun phrase | use “at” to name the matter that causes the reaction |
Quick tests
Event-or-matter test
Are you presenting the embarrassing event through an infinitive, or naming the matter that caused the reaction?
If yes: Use “mortified to + verb” for the event/action construction.
If no: Use “mortified at + noun phrase” for the named matter.
Caveat: Stay within the reviewed complement patterns; other prepositions may occur in broader usage but are outside this narrow comparison.
Examples
He was mortified to discover the message had gone to the whole list.
The infinitive presents the event that caused the embarrassment.
She was mortified at the mistake in the final version.
“At” introduces the matter causing the reaction.
They were mortified to hear the announcement and mortified at the confusion it created.
The two complements express different grammatical relationships.
Further guidance
Core difference
Use mortified + to-infinitive for the adjective followed by its documented complement pattern; use mortified at + noun phrase for the separately documented construction.
Style Boundary
Treat the distinction as a complement-pattern choice, not as a claim that every nearby preposition or clause is impossible. Follow the directly documented construction for the intended relationship.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- MORTIFIED — English meaning (opens in a new tab)Cambridge Dictionary · Direct dictionary evidence for mortified + to-infinitive.
- MORTIFIED — definition and meaning (opens in a new tab)Collins English Dictionary · Dictionary evidence for mortified at / about constructions.