improve, refine, enhance, polish, sharpen, perfect, work on, practice, groom, prepare
A synonym for temper is temperament.
A synonym for varied is diverse.
I don't think there is a synonym for adjoined it is an antonym.
A synonym of undeniable is nonviable.
A synonym for plausible is possible.
If you mean hone, then synonyms would be: acuminate, edge, file, grind, and whet.
Acuminate, dress, edge, file, grind, hone, make acute, make sharp, put a point on, put an edge on, sharp, stroke, strop, taper, whet.
regards hone
Hone Glendinning's birth name is Hone McMahon Glendining.
The word 'hone' can be either the noun or the verb form. There is also a gerund, honing. The noun 'hone' is the word for the whetstone or machine that is used to sharpen blades.
Hone Kaa died in 2012.
Hone Kaa was born in 1941.
Jeffery Hone was born in 1850.
Jeffery Hone died in 1888.
Hone Taiapa was born in 1911.
Hone Taiapa died in 1979.
Brian Hone was born in 1907.