Narrowly self-interested behaviour is ultimately self-defeating.是什么意思？

Narrowly self-interested behaviour is ultimately self-defeating.

狭隘自私的行为最终会自拆台脚。

narrowly

adv. 狭窄地，勉强地，严密地，仔细地；

例句
A fresh tragedy was narrowly averted yesterday.
昨天险些酿成一场新的悲剧。

behaviour

n. 行为，举止，（人、动植物、化学药品等的）表现方式，态度；na. “behavior”的变体；

例句
...homosexuals, whose sexual behaviour is still accounted sinful by the church.
其性行为仍然被教会认为是罪孽深重的同性恋者

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

ultimately

adv. 最后，最终，基本上，根本，郅；

例句
She may be cynical about the film industry, but ultimately she has no intention of biting the hand that feeds her.
她对电影业可能有些怀疑失望，但终究没有恩将仇报之意。