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Webster 1913 Edition

Adj.

Not assuming; not bold or forward; not arrogant or presuming; humble; modest; retiring;

as, an

unassuming

youth;

unassuming

manners.

Adj.

Not assuming; not bold or forward; not making lofty pretensions; not arrogant; modest; as an unassuming youth; unassuming manners.

unassuming ‎(comparative more unassuming, superlative most unassuming)

modest with no pretensions or ostentation

Russian: непритяза́тельный (ru) ‎(nepritjazátelʹnyj), скро́мный (ru) ‎(skrómnyj)
Swedish: anspråkslös (sv)