KEY: Immature.
SYN: Unripe, green, crude, imperfect, unfinished, undeveloped.
ANT: Ripe, complete, finished, mature, developed.

• Signalize
• Significant
• Signify
• Silence
• Silence \v
• Silent
• Silly, Germ, selig
• Similar
• Similitude
• Simple
• Simplicity
• Simplify
• Simulate
• Simultaneous
• Sin
• Sincere
• Sinful, [See EXCEPTIONAL_and_RARE]
• Single
• Singular
• Sinister
• Sink
• Situation
• {[Siu-'-ed]?}
• Size
• Sketch