simmering
Word family
Synonym discussion
Sense: verb/2
All four words describe negative feelings or conflicts that develop gradually beneath the surface, but each emphasises a different quality. Simmer (verb/2) suggests the feeling stays just below the point of open expression and could break out at any moment — like a pot about to boil over. Seethe is stronger and more violent: a person who seethes is barely holding back fury. Brew implies a slower, more involuntary development, as in 'trouble was brewing', often without a clear source. Fester adds the idea of emotional or interpersonal decay — an unresolved grudge that gets worse over time, like an infected wound. Smoulder suggests hidden, long-lasting anger that burns quietly without flames. Choose simmer for build-up with risk of explosion, seethe for barely-contained rage, brew for vague gathering trouble, fester for unresolved bitterness, and smoulder for quiet, enduring resentment.
Common collocations
Etymology
The word 'simmer' first appeared in English in the late 1400s, probably created to imitate the soft bubbling sound that a hot liquid makes just before it reaches boiling point. It may be related to the older English word 'simperen', which also described a gentle bubbling movement. The figurative use — for emotions or conflicts building up beneath a calm surface — developed around the 1600s.
First known use
1637
1637, in the meaning defined at intransitive sense 1 Noun