That allays something (in various senses of allay, v.1); diluting; tempering; assuaging.

Having the quality of tempering; alleviative, mitigating; tending to temperateness.

That moderates the harshness or severity of something; softening, mitigating, tempering.

That moderates.

That softens (in various non-physical senses); esp. that makes a person or thing less harsh, severe, or intense in feeling, appearance, or sensation.

That tempers; softening, mitigating.

That appeases; pacifying, quieting, calming.

That modulates (in various senses); acting to temper, regulate, or control.

That palliates (in various senses of the verb).

Tending or serving to mitigate; alleviating, extenuating, palliative; †soothing (obsolete).

That chastens; correcting, chastising; purifying, refining, subduing.

That makes mild or milder; calming.

That mitigates; alleviating, extenuating, moderating. Frequently in mitigating circumstances n. also in singular chiefly Law a fact or situation…