Unimpressive
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glorious, important-looking, heroic, stunning, ostentatious, fulgurous, spectacular, awe-inspiring, majestic, important, noble, baronial, lofty, fulgurant, stupefying, grandiose, arrogant, astonishing, awing, eye-popping, gallant, mind-boggling, dazzling, expansive, palatial, sensational, splendid, flashy, signal, significant, striking, dramatic, proud, awful, brilliant, grand, impressive, astounding, staggering, imposing, exceptional, amazing, stately, awesome, thundering, magnificent, formidable, arresting.