extremely quick in movement or action

fairly quick in speed

काफी तेज़

English Usage: She completed the race at quite a fast pace.

Hindi Usage: उसने दौड़ को काफी तेज़ गति से पूरा किया।

moving or capable of moving at high speed

happening in a short time or at a great rate

त्वरित

English Usage: The rapid changes in technology are astonishing.

Hindi Usage: तकनीकी क्षेत्र में त्वरित बदलाव आश्चर्यजनक हैं।