longest-lasting

adjective

UK /ˈlɒŋ.ɡɪst ˈlɑː.stɪŋ/

US /ˈlɔːŋ.ɡɪst ˈlæs.tɪŋ/

Something that keeps going for the most time without stopping or breaking.

This battery is the longest-lasting one we have ever used.

SYNONYMS

most durable most enduring most long-lived most persistent most permanent

RELATED WORDS

lasting durable enduring long-lived sturdy

OTHER MEANINGS

2. Continuing for the greatest amount of time compared to others.

Their friendship was the longest-lasting of all the kids in class.

3. Staying in good condition the longest before wearing out.

These boots are the longest-lasting pair I own.

4. Remaining in effect or memory for the greatest time.

The longest-lasting lesson from camp was to be kind.