Having qualities somewhat like dynamite; explosive or powerful in a way that resembles dynamite.
From dynamite + -ish (suffix meaning 'somewhat' or 'somewhat like'). This informal formation appeared in 19th-century writing as dynamite became a common cultural reference point.
The suffix '-ish' is one of English's most flexible tools—it can turn almost any noun into an adjective, which is why Victorians could write 'dynamitish' for something that wasn't quite explosive but came close.
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