wimp
wimp
/wɪmp/
(informal, disapproving)
a person who is not strong, brave or confident
He won’t go on his own—he’s a complete wimp!
Word Origin
1920s: origin uncertain, perhaps from whimper.
e.g.
This is ridiculous. Only a wimp would be hiding under a bed. ベッドの下に隠れるなんてヨワ虫だ (/yupeco/『ホーム・アローン』)