What this suffix does
The suffix -some comes from Old English "-sum" and forms adjectives meaning "producing that effect" or "characterised by that quality". awesome = inspiring awe (awe + some). gruesome = causing horror (Old English "grue" = shudder). loathsome = producing revulsion (loathe = to feel disgust). wholesome = promoting wellbeing (whole = entire, healthy). troublesome = causing trouble (trouble + some).