ava-sāda m. sinking (as of a chair) Suśr
• the growing faint (as of a sound) ib
• failing exhaustion, fatigue, lassitude ib
• defeat Mālav
• want of energy or spirit (especially as proceeding from doubtful or unsuccessful love) L
• (in law) badness of a cause L
• end, termination L. (cf. nir-av○.)

ava-sāda &c. ava-√sad 

Sanskrit-English Dictionary, by M. Monier William