1. Indicating opposition or resistance
   - counter 
2. Characterized by antagonism or antipathy
   "slaves antagonistic to their masters"
   - antipathetic, antipathetical 
3. Arousing animosity or hostility
   "his antagonistic brusqueness"; "Europe was antagonistic to the Unites States" 
4. Used especially of drugs or muscles that counteract or neutralize each other's effect
   - incompatible 
5. Incapable of harmonious association

See also: alienating, antacid, antagonism, antagonist, antagonistically, antiphlogistic, hostile, incompatible, negative

Antonym: conciliatory, synergistic

Encyclopedia: Antagonistic

• half-evergreen
• half-free morel
• half-hardy
• half-heartedly
• half-heartedness
• half-holiday
• half-hour
• half-hourly
• half-intensity
• half-length
• half-life
• half-light
• half-mast
• half-moon
• half-pay
• half-pint
• half-price
• half-relief
• half-seas-over
• half-size
• half-slip
• half-staff
• half-term
• half-timber
• half-timbered