robust (adj.)

1540s, of persons, "having or indicating great strength, muscular, vigorous," from 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" (related to robigo "rust"), from PIE root *reudh- "red, ruddy." Related: Robustly; robustness; robusticity.

Robustious (1540s) was an elaborated form common in 17c. (see "Hamlet" iii.2), with more of a sense of "rough, violent, rude;" according to OED it fell from use by mid-18c., but was somewhat revived by mid-19c. antiquarian writers. Related: Robustiously; robustiousness.

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Definitions of robust from WordNet

robust (adj.)
sturdy and strong in form, constitution, or construction;
a robust perennial
a robust body
robust (adj.)
marked by richness and fullness of flavor;
a robust claret
the robust flavor of fresh-brewed coffee
Synonyms: full-bodied / racy / rich
robust (adj.)
strong enough to withstand or overcome intellectual challenges or adversity;
a robust faith
the experiment yielded robust results
robust (adj.)
rough and crude;
a robust tale