Describing the character’s physical appearance
:<span>shy, </span><span>reserved, </span><span>diffident, </span><span>inhibited, </span><span>retiring, </span><span>reticent, </span><span>reluctant, </span>shrinking; <span>hesitant, </span><span>timid, </span><span>apprehensive, </span><span>nervous, </span><span>wary, </span><span>demure, </span><span>coy, </span><span>blushing</span>
Facts to back the information up.
My answer would be thwack, as in the suction y noise when you step out of the mud.