1. (a.) Being in first stages; elementary; initial; as, rudimentary essays\.

2. (a.) Very imperfectly developed; in an early stage of development; embryonic.

Lilliputian Tom Thumb abecedarian aboriginal antenatal arrested autochthonous backward basal basic basilar beginning budding central coarse creative crucial crude dumpy dwarf dwarfed dwarfish elemental elementary elfin embryonic essential fetal first formative foundational fundamental generative genetic germinal gestatory immature imperfect in embryo in its infancy in ovo in the bud in the rough inaugural inceptive inchoate inchoative incipient incunabular infant infantile initial initiative initiatory introductory inventive meager midget nanoid nascent natal original oversimple parturient postnatal pregnant prenatal primal primary prime primeval primitive primogenial primordial pristine procreative protogenic pygmy radical reductionistic reductive rough roughcast roughhewn rude rudimental runty scraggy scrubby seminal shriveled shrunk shrunken simplistic squat stunted unblown uncultivated uncultured uncut underdeveloped underlying undersize undersized undeveloped unfashioned unfinished unformed unhewn unlabored unlicked unpolished unprocessed unrefined unshaped untreated unworked unwrought ur vestigial wizened