- 1to guess or suppose something using the evidence you have, without definitely knowing synonym conjecture
- 2 From the looks on their faces, I surmised that they had had an argument.
NAmE//sərˈmaɪz//[transitive, intransitive]surmise (something)surmise (that)…surmise what, where, etc…+ speech(formal)Verb Forms present simple I / you / we / they surmise
he / she / it surmises
past simple surmised
-ing form surmising