expression, i-adjective
Describes a person who lacks courage, willpower, or determination; often used critically.
彼は意気地のない男だ。
He is a spineless man.
そんな意気地のないことを言うな。
Don't say such cowardly things.
弱虫 is a more direct and colloquial term for 'coward' or 'weakling', while 意気地のない is a descriptive adjective phrase.
From 意気地 (いくじ, 'willpower') + の + ない ('not have'), literally 'without willpower'.