هُوَ شُجَاعٌ لَا مُتَهَوِّرٌ.
He is courageous, not reckless.
In a relevant context, praise of courage might leave room for the mistaken idea of impulsive risk-taking. The qualifier 'lā mutahawwir' excludes that unintended implication. Its purpose is corrective, not merely descriptive expansion.
A plausible misconception must actually arise in the situation before calling the phrase iḥtirās. Without such a risk, the extra information may serve another function such as tatmīm.