Man is never tired of praying for good, but when any evil befalls him, he loses hope and is in despair
Dr. Munir Munshey
Man never tires of praying for the good (things in life), and becomes dejected and despondent when something bad afflicts him
Dr. Kamal Omar
A human being does not get tired of an invokation (or prayer) for good; and if an affliction touched him, then (immediately he is that) who has given up all hope, (and one) who has gone in despair
Man tires not of praying for good, but, if evil touch him, he is despairing, hopeless
Muhammad Ahmed - Samira
The human/mankind does not get bored/tired from the goodness' call/request/prayer , and if the bad/evil/harm touched him, so he is despairing/hopeless despaired
Man (the disbeliever) does not get tired of asking good (things from Allah), but if an evil touches him, then he gives up all hope and is lost in despair
Man is not weary of asking for good things... But if bad afflicts him, at once he loses hope and falls into despair.
Al-muntakhab fi tafsir al-Qur'an al-Karim
Nonetheless, man does not weary of invoking Allah's benefaction and benediction, but no sooner he is befallen with a misfortune or wedded to a calamity than he nurses despair and gives up hope