たいへんな　（大変） 英語で:

You're tough.

He won't be easily discouraged, because he's a tough guy.

He seems like a softy on the surface, but at the core he's got an iron will that makes him an extremely tough negotiator.

The heart itself is nothing more nor less than a large, tough, leather-like muscle.

It must be nice having someone who sticks around even when times get tough.

1. A customs officer was asking him lots of tough questions. / 2. Tough luck!

Whoo! Today's practice is tough - much harder than usual.

After having spent so much money on Christmas gifts, she found herself in a tough spot.

You should invest a little bit of your income into your career in these tough economic times.

No sooner had we finished working on one tough problem than the president sent us yet another straight from the top.

I'm sure it's tough taking part in the activities of two clubs, but good luck!

Work on the boat is tough but I can't see myself in any other profession.

The surgeon remarked that his patient was tough and that he should make a full recovery with no aftereffects.

It was a tough job. They asked some tough questions. Recently she’s had a tough time. It’s tough being married to a cop.

Earth we're finding that life in very primitive form exists in the most extreme environments, these are the so called 'extremophiles' that exist at the bottom of the oceans... So life is much, much tougher.