Levého
Levého is the genitive singular form of the Czech adjective levý, which means left. It is used to denote the left-hand side or left side of something in a setup where the noun it modifies is in the genitive case. As a grammatical inflection, levého appears with masculine and neuter nouns in the genitive singular, while feminine nouns use a different form (levé) in the same position.
In practical use, levého occurs in phrases such as levého oka (of the left eye), levého ramene
For comparison, the base form levý is used in the nominative masculine singular (the left), levá for
See also: levý (the base adjective meaning left). Levého is specifically the genitive singular inflection used