Synonyms:
- bovine,
- calm,
- cool,
- dispassionate,
- dull,
- equable,
- even,
- impassive,
- imperturbable,
- inexcitable,
- inirritable,
- levelheaded,
- patient,
- reposeful,
- serene,
- steady,
- stoic,
- stolid,
- tranquil,
- undisturbable,
- unflappable,
- unirritable,
- unnervous,
- unpassionate