Or search: bleak, stark, barren, hostile, desolate, windswept, unfriendly, uncongenial
2 Syllables: SU
mineral
3 Syllables: SUU
Biblical, clinical, criminal, difficult, digital, integral, liberal, literal, littoral, minimal, miracle, mythical, pinnacle, pitiable, pitiful, pivotal, syllable, typical, visceral, visible, visual
3 Syllables: USU
peripheral
4 Syllables: SUUU
equitable, formidable, veritable
4 Syllables: USUU
additional, admissible, conditional, derivable, despicable, divisible, divisional, Episcopal, equivocal, explicable, hospitable, illiberal, invisible, medicinal, municipal, nutritional, occipital, original, permissible, political, pontifical, predictable, provisional, reciprocal, satirical, traditional, transitional
5 Syllables: USUUU
discreditable, illimitable, indubitable, uncharitable, unprofitable
5 Syllables: UUSUU
aboriginal, inadmissible, individual, inexplicable, irresistible, monosyllables, unconditional, unequivocal, unpredictable

Found 67 words across 7 groupings. Skipped 8 excess words of a similar stem.