Reverse Dictionary: GRIEVOUS

ADJECTIVES
DEAR ► DERE hard, severe, heavy, grievous; dire, fell → a1000 arch.
DERF painful, grievous; terrible, dreadful, cruel → a1225 obs.
GRAVAMINOUS grievous, burdensome, annoying, distressing → 1659 obs.
IMPORTABLE too grievous or painful to be borne; unbearable, unendurable → c1386 obs.
IMPORTUNABLE burdensome, onerous, grievous, heavy → 1482 obs.
IMPORTUNATE burdensome; grievous, grave → c1540 obs.
IMPORTUNE troublesome, burdensome; vexatious; grievous, heavy, severe, exacting → c1400 obs.
NOISANT harmful, troublesome, grievous → a1440 obs.
SOROUS adj. grievous, distressing → 1502 obs.
SWEAMFUL grievous, distressing → c1430 obs.
SWEER grievous, oppressive → a1000 Sc. & N. Eng. dial., obs.
VENGIBLE grievous, severe → 1601 obs.
VEXSOME sorrowful, full of vexation; grievous, sad → 1852 Sc.

ADVERBS
DERELY grievously, extremely → 1830 Eng. dial.
DERF grievously, terribly → c1325 obs.
HEAVILY with sorrow, grief, displeasure, or anger; grievously → c1000 obs.
IMPORTUNATELY in a burdensome or grievous way; grievously, troublesomely → 1564 obs.
IMPORTUNELY grievously, troublesomely → a1656 obs.

NOUNS
GRIEVOUSTY grievousness;  heinousness → 1410 obs.