"even tough" is correct and can be used in written English.
It is an adverb phrase used to express a contrast between two things. For example: "He wanted to quit, even tough he was doing well in the competition."
Woods is even tough on his friends.
His eye for detail could make even tough restaurateurs wince.
And it seems even tough guys like a cosy fake-fur lining.
It's even tough enough to crush ice and we love the pastel colours too.
But even tough debates can be conducted in a civil tone.
Nothing grows well under it; even tough campaigners like vinca and lamium struggle.
Even tough guys have to say sorry sometimes, and Recep Tayyip Erdoğan is no exception.
"But he started blending in with guys that traditionally even tough guys would have a hard time getting along with.
His music has a right-guy, right-place, right-time quality that says even tough things with a breezy confidence.
Even tough, the response surface pointed out that the process is already within the optimum zone, optimization with the reduced model pointed further improvement in the amount of hexane recovered.
Rather, he's fascinated by "audio terroir", the ways in which environments – even tough, unprepossessing ones – can gestate and nurture novel sounds.
