Tetchy is an adjective that means bad-tempered and irritable. 

Our word of the day has something of a mysterious origin, but it seems it may have been derived from the Scots word tache (TACH) which means ‘fault.’ After drifting into English it’s maintained its current form since the late 16th century. 

Steve is a brilliant plumber but his tetchy personality makes it hard for him to get clients. Sometimes the best career advice is to simply not be a grouch.