fatherless (adj.)

• abandoned
• baseborn
• bastard
• bereaved
• bereft
• defenseless
• deprived
• deserted
• desolate
• forlorn
• forsaken
• friendless
• godforsaken
• helpless
• homeless
• misbegotten
• motherless
• natural
• orphaned
• outcast
• parentless
• pregnable
• spurious
• supposititious
• unprotected
• untenable
• vulnerable
• widowed