| callow | (adjective) young and inexperienced | Synonyms: fledgling, unfledged |
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| fallow | (adjective) undeveloped but potentially useful | - |
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| (adjective) left unplowed and unseeded during a growing season | - |
| hollow | (adjective) not solid; having a space or gap or cavity | - |
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| (adjective) lacking in substance or character | - |
| (adjective) devoid of significance or force | Synonyms: empty, vacuous |
| (adjective) as if echoing in a hollow space | - |
| mellow | (adjective) slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana) | Synonyms: high |
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| (adjective) unhurried and relaxed | Synonyms: laid-back |
| (adjective) having a full and pleasing flavor through proper aging | Synonyms: mellowed |
| (adjective) softened through age or experience | Synonyms: mellowed |
| sallow | (adjective) unhealthy looking | Synonyms: sickly |
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| shallow | (adjective) lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center | - |
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| (adjective) not deep or strong; not affecting one deeply | - |
| (adjective) lacking depth of intellect or knowledge; concerned only with what is obvious | - |
| yellow | (adjective) of the color intermediate between green and orange in the color spectrum; of something resembling the color of an egg yolk | Synonyms: xanthous, yellowish |
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| (adjective) easily frightened | Synonyms: chicken, chickenhearted, lily-livered, white-livered, yellow-bellied |
| (adjective) cowardly or treacherous | - |
| (adjective) changed to a yellowish color by age | Synonyms: yellowed |
| (adjective) typical of tabloids | Synonyms: scandalmongering, sensationalistic |
| (adjective) affected by jaundice which causes yellowing of skin etc | Synonyms: icteric, jaundiced |