caustic (n.)
- acid
- acute
- arc
- astringent
- belligerent
- bitter
- bow
- brand
- burning
- catenary
- cauterant
- cautery
- circle
- corroding
- corrosive
- crisp
- crook
- curl
- curve
- cutting
- dry
- electrocautery
- ellipse
- festoon
- hard
- hook
- hostile
- hyperbola
- keen
- mordant
- parabola
- radium
- rough
- sharp
- sinus
- sore
- sour
- stewing
- stinging
- stringent
- tart
- tracery
- withering
caustic (adj.)
- acerb
- acerbic
- acid
- acidic
- acidulent
- acidulous
- acrid
- acrimonious
- acute
- angry
- antagonistic
- antipathetic
- astringent
- belligerent
- biting
- bitter
- brisk
- burning
- choleric
- clashing
- coarse
- conflicting
- corrosive
- crisp
- critical
- cutting
- cynical
- despiteful
- destructive
- discontented
- double-edged
- dry
- edged
- fierce
- hard
- harsh
- hateful
- hook
- hostile
- incisive
- ironic
- irritating
- keen
- malevolent
- malicious
- malignant
- mordacious
- mordant
- penetrating
- piercing
- piquant
- pithy
- poignant
- pungent
- quarrelsome
- rancorous
- repugnant
- resentful
- rigorous
- rough
- salty
- sarcastic
- sardonic
- satiric
- scathing
- scorching
- severe
- sharp
- sore
- sour
- spiteful
- splenetic
- stabbing
- stinging
- strident
- stringent
- succinct
- tart
- terse
- trenchant
- vehement
- venomous
- violent
- virulent
- vitriolic
- withering
