heavy

heavy (Burdened), adjective benumbing, careworn, clumsy, dejected, depressed with sorrow, dull, dulled, gloomy, languid, leaden, serious, sluggish, somber, stolid, tempestuous, tiresome, torpid, violent, weary
Associated concepts: heavy burden to fulfill in order to prove a case

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heavy (Important), adjective commanding, eventful, immense, noteworthy, overwhelming, prominent, solemn, vast

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heavy (Onerous), adjective afflictive, burdensome, consequential, critical, cumbersome, difficult, excessive, grave, grievous, hard, imposing, intense, intolerable, notable, oppressive, striking, severe, substantial, trying, unbearable, unpleasant, unwieldy, wearying

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heavy (Ponderous), adjective careful, deliberate, profound, serious, weighty

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See also: grave, intense, onerous, oppressive, pedestrian, ponderous, profound, solemn, torpid