H3510 כָּאַב (kaw-ab')

KJV renderings: grieving, mar, have pain, make sad (sore), (be) sorrowful.
Strong's definition: properly, to feel pain; by implication, to grieve; figuratively, to spoil
Derivation: a primitive root;

From James Strong's public-domain dictionaries (H), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.