Answer: mildmannered

AnswerCrossword Clue
MILDMANNEREDLike the gentle meteorologist?
MILDMANNEREDNot at all aggressive
MILDMANNEREDUnlikely to rock the boat
MILDMANNEREDLike Clark Kent
MILDMANNEREDGentle in nature
MILDMANNEREDNot prone to flying off the handle