| fathead | (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, goof, goofball, goose, jackass, twat, zany |
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| fatheaded | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncical, duncish, loggerheaded, thick-skulled, thick, thickheaded, wooden-headed |
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| father | (noun) a male parent (also used as a term of address to your father) | Synonyms: begetter, male parent |
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| (noun) the founder of a family | Synonyms: forefather, sire |
| (noun) a person who holds an important or distinguished position in some organization | - |
| (noun) a person who founds or establishes some institution | Synonyms: beginner, founder, founding father |
| (noun) the head of an organized crime family | Synonyms: don |
| (verb) make (offspring) by reproduction | Synonyms: beget, bring forth, engender, generate, get, mother, sire |
| fatherhood | (noun) the status of a father | - |
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| (noun) the status of a religious leader | - |
| (noun) the kinship relation between an offspring and the father | Synonyms: paternity |
| fatherland | (noun) the country where you were born | Synonyms: country of origin, homeland, mother country, motherland, native land |
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| fatherless | (adjective) not having a known or legally responsible father | - |
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| (adjective) having no living father | - |
| fatherlike | (adjective) like or befitting a father or fatherhood; kind and protective | Synonyms: fatherly |
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| fatherliness | (noun) the benignity and protectiveness of or befitting a father | Synonyms: paternal quality |
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| fatherly | (adjective) like or befitting a father or fatherhood; kind and protective | Synonyms: fatherlike |
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| fathom | (noun) a linear unit of measurement (equal to 6 feet) for water depth | Synonyms: fthm |
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| (noun) (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore | Synonyms: fthm |
| (verb) measure the depth of (a body of water) with a sounding line | Synonyms: sound |
| (verb) come to understand | Synonyms: bottom, penetrate |
| fathomable | (adjective) (of depth) capable of being sounded or measured for depth | Synonyms: plumbable, soundable |
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| (adjective) (of meaning) capable of being penetrated or comprehended | - |
| fathometer | (noun) depth finder for determining depth of water or a submerged object by means of ultrasound waves | Synonyms: sonic depth finder |
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| forefather | (noun) the founder of a family | Synonyms: father, sire |
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| (noun) person from an earlier time who contributed to the tradition shared by some group | - |
| godfather | (noun) any man who serves as a sponsor for a child at baptism | - |
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| (noun) someone having a relation analogous to that of a male sponsor to his godchild | - |
| grandfather | (noun) the father of your father or mother | Synonyms: gramps, grandad, granddad, granddaddy, grandpa |
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| housefather | (noun) a man in charge of children in an institution | - |
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| stepfather | (noun) the husband of your mother by a subsequent marriage | - |
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| unfathomable | (adjective) of depth; not capable of being sounded or measured | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, abyssal |
| (adjective) incapable of being fully understood | - |
| unfathomed | (adjective) situated at or extending to great depth; too deep to have been sounded or plumbed | Synonyms: profound, unplumbed, unsounded |
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