This is the 8362nd most frequent Japanese word.
心強い
Reassuring; encouraging; heartening.
In this context, '心強い' is used to express reassurance or encouragement received from others.
友人が応援してくれるのはとても心強いです。
It is very reassuring to have a friend cheering for you.
Here, '心強い' conveys a sense of security or confidence provided by someone's presence or help.
初めての海外旅行ですが、現地ガイドがいるので心強いです。
It's my first trip abroad, but having a local guide is reassuring.
'心強い' in this sentence is used to indicate a sense of capability or encouragement derived from someone's expertise.