ETYM Latin acer sharp; prob. assimilated in form to acid. Related to Eager.
Strong and sharp.
Harsh or corrosive in tone.

ETYM Latin caustucs, Greek, from kaiein to burn. Related to Calm, Ink.
Of a substance, especially a strong acid; capable of destroying or eating away by chemical action; SYN. corrosive, erosive, vitriolic.

ETYM Cf. French corrosif.
1. Eating away; having the power of gradually wearing, changing, or destroying the texture or substance of a body.
2. Having the quality of fretting or vexing.

(Homonym: offal).
1. Disgusting, or of very poor quality; SYN. horrible, terrible.
2. Causing fear or dread or terror; SYN. dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible.

ETYM Old Eng. horrible, orrible, Old Fren. horrible, orrible, French horrible, from Latin horribilis, from horrere. Related to Horror.
1. Detestable; aweful.
2. Ugly.

In an acid manner; sourly; tartly

In a corrosive manner; destructively