1. (adverb) for a limitless time

• eternally
• everlastingly
• evermore

2. (adverb) for a very long or seemingly endless time

• forever and a day

3. (adverb) without interruption

• always
• constantly
• incessantly
• perpetually

1. (adverb) for a limitless time

• aeonian
• aeonian
• ageless
• ageless
• eonian
• eonian
• eternal
• eternal
• everlasting
• everlasting
• perpetual
• perpetual
• unceasing
• unceasing
• unending
• unending

2. (adverb) without interruption

• ceaseless
• ceaseless
• ceaseless
• constant
• constant
• constant
• incessant
• incessant
• incessant
• never-ending
• never-ending
• never-ending
• perpetual
• perpetual
• perpetual
• unceasing
• unceasing
• unceasing
• unremitting
• unremitting
• unremitting