lacking force or effectiveness

असक्षम

English Usage: The feeblish argument did not convince anyone.

Hindi Usage: कमज़ोर तर्क ने किसी को भी मनाने में सफल नहीं हुआ।

weak or lacking strength

कमज़ोर

English Usage: His feeblish attempt to lift the heavy box failed.

Hindi Usage: उसका भारी डिब्बा उठाने की कमज़ोर कोशिश बेकार हो गई।