Attack (आक्रमण) : defend
Ability (योगयता) : inability
Advance (अग्रिम, आगे बढ़ना): retreat
Adversity (विपत्ति) : Prosperity
Arrival (आगमन) : departure
Ancient (प्राचीन) : modern
Arrest (गिरफ्तार करना) : release, free
Ascent (आरोहण, चढ़ाई): descent