Solution

STIFFENS

2 clues

Hardens

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

Other solutions to Hardens

Tenses up

Word class: Verb
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Psychology - Emotions - Feelings

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