To sound out - to carefully found out what someone thinks or knows. Example - "I don't know what Jane thinks about your suggestions but I will sound her out"
Harebrained - ill-judged; very silly or foolish. Example - "It was a harebrained idea to go for a hike in an area where grizzly bear attacks had recently been reported"
Dilettante - a person who cultivates an area of interest, such as the arts, without real commitment or knowledge; a dabbler. Example - "You can always tell a true expert from a dilettante"
To show somebody the ropes - to explain to someone how to do a job or activity. Example - "The new secretary started today so I spent most of the morning showing her the ropes"
Marauding - going from one place to another killing or using violence, stealing, and destroying. Example - "Witnesses reported gangs of marauding soldiers breaking into people's houses and setting fire to them"