softest

yielding readily to pressure or weight
compassionate and kind; conciliatory;
(of sound) relatively low in volume;
easily hurt;
produced with vibration of the vocal cords; ;
not protected against attack (especially by nuclear weapons);
used chiefly as a direction or description in music;
(of light) transmitted from a broad light source or reflected
(of speech sounds); produced with the back of the tongue raised toward the hard palate; characterized by a hissing or hushing sound (as `s' and `sh')
(of a commodity or market or currency) falling or likely to fall in value;
using evidence not readily amenable to experimental verification or refutation;
tolerant or lenient;
soft and mild; not harsh or stern or severe;
having little impact;
out of condition; not strong or robust; incapable of exertion or endurance;
willing to negotiate and compromise
not burdensome or demanding; borne or done easily and without hardship;
mild and pleasant;
not brilliant or glaring;

softest is a valid Scrabble (US) TWL word

softest is a valid Scrabble Word in Merriam-Webster MW Dictionary

softest is a valid Scrabble Word in International Collins CSW Dictionary

softest is a valid Words With Friends word