un-robust

adjective

1. strong and healthy; hardy; vigorous: a robust young man; a robust faith; a robust mind.
2. strongly or stoutly built: his robust frame.
3. suited to or requiring bodily strength or endurance: robust exercise.
4. rough, rude, or boisterous: robust drinkers and dancers.
5. rich and full-bodied: the robust flavor of freshly brewed coffee.
6. strong and effective in all or most situations and conditions: The system requires robust passwords that contain at least one number or symbol. Our goal is to devise robust statistical methods.

adjective

1. strong in constitution; hardy; vigorous
2. sturdily builta robust shelter
3. requiring or suited to physical strengtha robust sport
4. (esp of wines) having a rich full-bodied flavour
5. rough or boisterous
6. (of thought, intellect, etc) straightforward and imbued with common sense

adj.1540s, from Middle French robuste (14c.) and directly from Latin robustus “strong and hardy,” literally “as strong as oak,” originally “oaken,” from robur, robus “hard timber, strength,” also “a special kind of oak,” named for its reddish heartwood, from Latin ruber “red” (cf. robigo “rust”), from PIE *reudh- (see red (adj.1)). Related: Robustly; robustness. Robustious (1540s) was a common form in 17c. (cf. “Hamlet” iii.2); it fell from use by mid-18c., but was somewhat revived by mid-19c. antiquarian writers.