Making one feel reassured or encouraged; giving confidence because of support or help.
あなたが手伝ってくれると心強い。
It's reassuring that you'll help me.
留学中に友達ができて本当に心強かった。
I felt really encouraged when I made friends while studying abroad.
上司からの一言が心強く感じられた。
A single word from my boss made me feel reassured.
新しいマニュアルがあるので、作業が心強い。
Having a new manual makes the work feel more secure.