at first
B1 in or at the beginning:
At first, I thought he was joking but then I realized he meant it.
Thesaurus: synonyms and related words
First and firstly
- begin
- debut
- first come, first served idiom
- firstly
- for starters idiom
- formative
- in the first/second place idiom
- inaugural
- initial
- initially
- introduction
- opener
- place
- prefatory
- primary
- proto-
- starter
- to begin with idiom
- ur-
- word
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