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XXXXXX means lack of YYYYYY
слабак - physical strength or courage
хлюпик - physical strength
доходяга - physical strength (maybe temporarily: in a bad form)
шибзик/шибздик - constitution
слюнтяй...

What is the emotional essence of "pansy"? Is it negative characteristics assuming disrespect? If it is then may be "слабак". "Слабак" per se :) has nothing common with homosexual or female-like.
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