Solution

HARDEN

2 clues

Solidify

Word class: Verb
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Materials, Science

Other solutions to Solidify

Toughen

Word class: Verb
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Materials

Words are categorized by artificial intelligence: there can be mistakes.