(mathematics) Having a unique solution whose value changes only slightly if initial conditions change slightly

Somewhat fat.

extending good wishes

act of extending good wishes to someone else

present participle of well-wish

Wishing well; well-inclined; favourable; friendly; propitious.

(archaic, of a person) good-humoured, pleasant, having an even temperament

(idiomatic) Efficient; efficiently run. / (idiomatic) Drunk.

(set theory, order theory) Capable of being well-ordered.

Of comparable strength or power. / Suitable to be in a relationship with one another.