1. in a manner that is extremely deep, endless, or seemingly without limit
Usage: often used figuratively to describe emotions, needs, or qualities that appear infinite
2. in a way that suggests or implies the absence of a bottom or foundation
Usage: literal or metaphorical use

Examples

• She stared bottomlessly into the dark ocean.
• His appetite seemed bottomlessly deep.
• The well appeared bottomlessly dark.
• He gazed at her with bottomlessly sad eyes.
• The pit seemed bottomlessly vast.
• Her compassion was bottomlessly generous.